The Formula One effort initially looked promising, with March supplying its 701 chassis to Tyrrell for Jackie Stewart. These cars were merely a stopgap for Tyrrell, who no longer had the use of Matra chassis and were in the process of constructing their own car; March was the only option available given clashing fuel contracts. In addition, the factory ran two team cars for Jo Siffert (Porsche were paying for his drive) and Chris Amon sponsored by STP. A third STP car, entered by Andy Granatelli for Mario Andretti, appeared on several occasions. Ronnie Peterson appeared in a semi-works car for Colin Crabbe when his works Formula Two commitments allowed; various other 701s went to privateers. The team constructed ten Formula One chassis that year, in addition to Formula Two, Formula Three, Formula Ford and Can-Am chassis. Stewart gave the March its first Formula One victory, at the 1970 Spanish Grand Prix, and both Amon and Stewart took a non-championship race victory, but the works team did not win a Grand Prix. The 701 had distinctive aerofoil-profile fuel tanks at the sides of the car designed by Peter Wright of Specialised Mouldings; Wright had been involved with BRM's abortive ground-effect programme in the late sixties and later worked on the groundbreaking Lotus 78. The 701's tanks lacked endplates and skirts to help generate any meaningful ground effect. Herd (in Mike Lawrence's history of the team "Four Guys and a Telephone") described the 701 as essentially a good 1969 car and not what he would have done had he been able to run a small team for a star like Rindt - the 701 was designed and built very quickly and he claims he would have built something more like the 711.