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

<P0-S0> 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. <P0-S1>  The Thunderbird created a market niche that eventually became known as the personal luxury car. <SEP> <P1-S0> 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. <P1-S1>  It was memorable in that it marked Dale Earnhardt's only Daytona 500 victory after 19 previous attempts and many heartbreaking finishes. <P1-S2>  Not only was it Earnhardt's 20th 500 start, but also CBS's 20th consecutive live broadcast of the Daytona 500. <P1-S3>  Also, his long-awaited Daytona 500 win snapped a 59-race winless streak dating back to Atlanta Motor Speedway in March 1996. <SEP> <P2-S0> The 1985 Daytona 500, the 27th running of the event, was held on February 17, 1985, at Daytona International Speedway, in Daytona Beach, Florida. <P2-S1>  Bill Elliott won the pole at a then-record speed of 205.114 mph. <P2-S2>  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. <P2-S3>  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. <P2-S4>  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. <SEP> <P3-S0> 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. <P3-S1>  Pole qualifying for the Daytona 500 is held one weekend before the race at the Daytona International Speedway. <P3-S2>  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. <P3-S3>  The first Daytona 500 was held in 1959 and in 1982, it became the opening event for the NASCAR Cup season. <P3-S4>  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. <P3-S5>  The two drivers who complete a lap with the fastest time are awarded the first and second starting positions for the Daytona 500. <P3-S6>  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. <P3-S7>  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.