I looked at another thread again and found this link:

PowerMac 6100 Graphics . . .

. . . which lead me to discover that the card I want for my 81/110 is the 8100 HPV Card part #661-1027 2 to 4 MB VRAM configs. :approve:

Unfortunately, the 7100 shipped with part #661-1748 and what I've got would be the 7100 Card in 1 & 2 MB VRAM Configs. :disapprove:

I'll rummage through the stuff again. In one big lot I got some 512 MB VRAM SIMMs and an Aluminum HPV Adapter Cage, presumably for a NewerTech G3 Card . . .

. . . maybe I'll find the 8100 HPV Card somewhere around here too . . . :-/