Table:
text: 1975 Swiss Grand Prix
Classification
Classification
Pos No_ Driver Constructor_ Laps Time_Retired Grid_
11 9 Vittorio Brambilla March-Ford 58 + 2 Laps 12
12 22 Rolf Stommelen Hill-Ford 58 + 2 Laps 14
13 35 Tony Trimmer Maki-Ford 54 + 6 Laps 16
NC 20 Jo Vonlanthen Williams-Ford 51 + 9 Laps 15
Ret 17 Jean-Pierre Jarier Shadow-Ford 33 Transmission 1
Ret 1 Emerson Fittipaldi McLaren-Ford 6 Clutch 2

text: 1975 Swiss Grand Prix
Classification
Classification
Pos No_ Driver Constructor_ Laps Time_Retired Grid_
1 12 Clay Regazzoni Ferrari 60 1:01:25.34 3
2 4 Patrick Depailler Tyrrell-Ford 60 + 0:08.35 5
3 2 Jochen Mass McLaren-Ford 60 + 0:15.44 4
4 5 Ronnie Peterson Lotus-Ford 60 + 0:40.14 10
5 18 John Watson Surtees-Ford 60 + 0:45.55 6
6 8 Carlos Pace Brabham-Ford 60 + 0:45.90 7
7 16 Tom Pryce Shadow-Ford 60 + 0:46.66 8
8 24 James Hunt Hesketh-Ford 59 + 1 Lap 11
9 31 Chris Amon Ensign-Ford 59 + 1 Lap 9
10 21 Jacques Laffite Williams-Ford 59 + 1 Lap 13

Question: How many McLaren-Ford designers are represented at the 1975 Swiss Grand Prix?