The rear bumper is part of the Lingenfelter Aerobody. I don't know if they will sell only the rear bumper.
http://www.lingenfelter.com/pack_cor_c4bk.htm
John Lingenfelter's yellow 95 ZR-1 had only the rear bumper installed. I understand he wanted more downforce from the bigger spoiler during his 225 mph run.
The tips were hand made by Texas Quality Exhaust in Houston. That's why they are just a bit irregular.
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Jerry Downey
JERRYS LT5 GASKETS & PARTS
http://www.jerrysgaskets.com
1994
ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc.
2016 Black-Red, 3LT-Z51 Auto 8-speed.