You're looking for the Battle Boxes made by Wild Rides... Check out this link:
http://www.wildridesracecars.com/chassis.html
-J
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1991 GT Vert- Black/Black/Black
MAC 1 5/8" Headers, 2 1/2" H-pipe, 2 1/2" Flows, Tremec, Centerforce Dual Friction, BBK Adj. Quadrant, 3.73s, 3-core rad., K&N, 130Amp Alt., PS-91, Tri-Ax, Blistein Struts/Shocks, H&R Springs, MM Chassis Brace Package, MM C/C Plates, Front-End Poly's, Rear Seat Delete