When a Williams found its way on to the grid of the Indy 500

The 65th running of the Indy 500 held back in 1981 saw an interesting and somewhat familiar-looking car line up on the event's 33-car grid.

A four-time winner at the Brickyard, Al Unser Sr was at the wheel of a Cosworth DFX-powered Longhorn which was actually a reconditioned Williams FW07 updated to IndyCar specs, a car Alan Jones had originally driven to the F1 world championship title in 1980.

Despite the #88 car's prestigious pedigree, it wasn't of much help to Unser who was classified 17th at the end of the day, 34 laps down.

There was a reason to rejoice however for the Unser family, as Big Al's brother, the late Bobby Unser who passed away last week, took his third Indy 500 win on the day driving for Team Penske.