You won’t find that GM discontinued part (discontinued in 1999) unless it’s from someone parting-out or willing to sell a part of an assembly.
SECRET:
Try a non-ZR1 panel and retrofit it by drilling holes to attach a ZR1’s control modules/relays located on the backside of the rear of the panel. It has
been done. Perhaps that’s the reason 10276500 was discontinued; if so, it’s a "secret."
The part number for that alternate (non-ZR1) panel is 10276498; however, verify part number when ordering. It is not a high-cost item.
Article ID: 488
Created: July 24, 2014
Last Updated: July 24, 2014
Online URL: https://www.corvetteactioncenter.com/tech/knowledgebase/article/1990-1995-corvette-zr-1-wheel-well-locating-the-panel-that-fits-in-the-rear-portion-of-the-right-front-wheel-well-488.html