Question: How many model generations did the car Bill Elliott won the 1985 Daytona 500 in have?

Context articles: 2006 Daytona 500
List of Daytona 500 pole position winners
2001 Daytona 500
2010 Gatorade Duels
Can-Am Duel
1987 Daytona 500
Ford Thunderbird
1999 Daytona 500
1985 Daytona 500
1998 Daytona 500

The 2006 Daytona 500, the 48th running of the event, was the first race in the 2006 NASCAR Nextel Cup season.
 It was held on February 19, 2006 at Daytona International Speedway in Daytona Beach, Florida.
 Jimmie Johnson won the race in a green-white-checker finish.
 It was the second Daytona 500 in a row to go longer than 200 laps and 500 miles ; this race, like the previous Daytona 500, had a total distance of 203 laps and 507.5 miles .
 This was also the first Daytona 500 to end after dark, ending even later than the 2005 race, in which the checkered flag had waved just a few moments after sunset.
Daytona 500 pole position winners for the Monster Energy NASCAR Cup Series's Daytona 500 are rewarded with being the driver to lead the field across the start line at the beginning of the 200-lap 500 mi race.
 Pole qualifying for the Daytona 500 is held one weekend before the race at the Daytona International Speedway.
 The driver to complete the fastest single lap in the final of three rounds in the knockout qualifying session around the 2.5 mi high-banked tri-oval superspeedway earns the pole position.
 The first Daytona 500 was held in 1959 and in 1982, it became the opening event for the NASCAR Cup season.
 The term "pole position" was originally coined in the American horse racing industry, and indicated the position of the starter being next to the "poles", which established the boundaries of the course.
 The two drivers who complete a lap with the fastest time are awarded the first and second starting positions for the Daytona 500.
 An additional 33 to 35 entrants are determined by a combination of the results of two qualifying races and the position of the team in the previous season's point rankings.
 The remainder of the 43 car field consists of drivers who meet certain qualifications, such as qualifying speed or being one of the previous NASCAR champions.
The 2001 Daytona 500, the 43rd running of the event, was the first race of the 2001 NASCAR Winston Cup Series schedule.
 It was held on February 18, 2001 at Daytona International Speedway in Daytona Beach, Florida, consisting of 200 laps and 500 miles on the 2.5-mile (4 km) asphalt tri-oval.
 The race was the first ever Winston Cup telecast shown by the Fox network, which had received broadcasting rights along with NBC at the end of the previous season, replacing the two former NASCAR broadcasting channels CBS and ESPN.
 Bill Elliott won the pole and Michael Waltrip, in his first race in the No. 15 car for Dale Earnhardt, Inc., won the race.
 This was the first Winston Cup victory of his career, coming in his 463rd start, the longest wait for a first win.
 His teammate Dale Earnhardt Jr. finished second and Rusty Wallace finished third.
The 2010 Gatorade Duels were two 150 mi qualifying races for the 2010 Daytona 500 held on February 11, 2010 at the 2.5 mi Daytona International Speedway in Daytona Beach, Florida.
 The races determined the field for the race on Sunday, February 14, 2010.
 Prior to the Duels, only two drivers had their starting positions locked into the 500, they were pole-sitter Mark Martin and Dale Earnhardt, Jr..
 Bill Elliott, Joe Nemechek, Scott Speed, and Bobby Labonte were the four fastest non-top 35 drivers, thus locked in.
The Can-Am Duel, formerly known as the Twin 125s, is a Monster Energy NASCAR Cup Series preliminary event to the Daytona 500 held annually in February at Daytona International Speedway.
 It consists of two 150 mi races, which both serve as a qualifying race for the Daytona 500.
 The finishing order in the two 150 mi races, held on the Thursday before the Daytona 500, determine the starting lineup for the Daytona 500 held on race day.
The 1987 Daytona 500, the 29th running of the event, was held February 15 at Daytona International Speedway, in Daytona Beach, Florida.
 Bill Elliott won the pole and the race.
The Ford Thunderbird is a rear wheel drive automobile which was manufactured by Ford in the United States over eleven model generations from 1955 through 2005.
 The Thunderbird created a market niche that eventually became known as the personal luxury car.
The 1999 Daytona 500, the 41st running of the event, was held February 14, 1999, at Daytona International Speedway.
 Jeff Gordon won the pole and won the race, making him the first Daytona 500 pole sitter to win the race since Bill Elliott in 1987.
The 1985 Daytona 500, the 27th running of the event, was held on February 17, 1985, at Daytona International Speedway, in Daytona Beach, Florida.
 Bill Elliott won the pole at a then-record speed of 205.114 mph.
 After a mediocre run in the Busch Clash, Elliott nearly lapped the field in his 125-mile qualifying race, then thoroughly dominated the Daytona 500, leading 136 of the 200 laps in his #9 Coors/Melling Ford Thunderbird.
 The race restarted on the last lap after a Neil Bonnett spin out with less than four laps to go; Bonnett got out of his car and was credited for a 10th-place finish.
 The race saw a number of engine problems, which knocked many of the contenders, including former Daytona 500 winners David Pearson, AJ Foyt, Benny Parsons, Bobby Allison, and two-time defending race winner Cale Yarborough, who was trying to win his third straight Daytona 500 victory.
The 1998 Daytona 500, the 40th running of the event, was held on February 15 at Daytona International Speedway in Daytona Beach, Florida as the first race of the 1998 NASCAR Winston Cup season.
 It was memorable in that it marked Dale Earnhardt's only Daytona 500 victory after 19 previous attempts and many heartbreaking finishes.
 Not only was it Earnhardt's 20th 500 start, but also CBS's 20th consecutive live broadcast of the Daytona 500.
 Also, his long-awaited Daytona 500 win snapped a 59-race winless streak dating back to Atlanta Motor Speedway in March 1996.