There were either 27 or 28 black w/red interior 1991 ZR-1s produced. One was a Canadian export, and 5 were Japan exports. All production lists, as well as other interesting information, is listed on the main website (
www.zr1netregistry.com) under the "Member's Only" section. You may find the owners and location of these cars in the "Registry", also listed in the same section.
(I have 28 listed as the number in my personal registry documents that I've worked on for the last 10+ years.)
Regards,
Mark