Ron Tauranac also made some development changes later in the season. Italian engineer Gian Paolo Dallara was brought into the team to redesign the rear suspension during the 1973 season. The car's lines were angular except for the rounded cockpit. The fuel tanks were positioned on either side of the cockpit.
It featured double wishbone front suspension with upper and lower links at the rear, and outboard springs all round. Another conventional design, it followed the design thinking of the current trend of F1 cars of a low centre of gravity and wedge shape pioneered by the Lotus 72 and McLaren M23. The result was the IR (the initials standing for Iso Rivolta, although the company had no part in the car's gestation), designed by ex March engineer John Clarke.
As Williams's current chassis, the Iso–Marlboro FX3B, did not conform to 1973's new deformable structure regulations, a new car had to be designed.
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