ws7?
"...The WS6 option, available on the S/E's and Trans Ams, included 4-wheel disc brakes, P215/65R15 Goodyear Eagle GT radials with 15-inch (380 mm) cast aluminum wheels, stiffer springs, thicker front and rear sway bars, a high ratio 12.7:1 steering box, and limited slip rear differential. There was also the WS7 option, which was the same as the WS6, except for the lack of the 4-wheel disc brakes. In 1983, the Third Generation Trans Am was selected as the Daytona 500 Pace Car, and Pontiac offered a total of 2500 Daytona Pace Car replicas through their dealerships...."
http://en.wikipedia.org/wiki/Pontiac_Firebird






