The "ZTrix IMSA" (TM) five-piece kit (airdam, fenders, quarter panels) replicates the look of the  fender kits first designed for the "IMSA" (International Motor Sports Association) racing series in the 1970s.While the front components are similar to the traditional IMSA kit, ZTrix designed the unique rear quarters. 

On Stuart Jamison's Rebello-powered 1978 Datsun 280Z, the vintage HRE 505 wheels are 17x10.5 front, 17x14 rear, with a 2.25" backspace. The rears are shod with 345/40R17 Toyo Proxes tires. 

A variety of rear spoilers and wings (not included with the kit) will work with the rear quarter panels, since they are narrow at the back to meet the stock taillight panel.