It's a smooth, white, plastic cylinder with a matte - gray, plastic tip and a removable rear cap with a Lightning jack under it. (goodereader.com)
The optional Design Pure Extravagance package offers exterior elements in Cerium Grey, such as the kidney Grill frame, the front of the kidney slats, front and rear underbody protection made of brushed stainless steel, mirror caps, Air Breather, running boards, side window frames as well as the trim strips on the rear (autosarena.com)
Earlier photos published by CorvetteBlogger appear to show the smaller wing mounts extend into the rear cap and its our supposition that active aerodynamics will play a role on the ZR1. (corvetteblogger.com)