FBz found this one (I also found it yesterday)
109-73500-21 ATI Radeon Rage VGA / ADC AGP Video Graphics Card
https://www.memory4less.com/ati-tech-video-graphics-card-109-73500-21So I am guessing this is the exact card (minus the special cube bracket), layout looks identical, part number just one off...
The cube card is: 109-73500-
20The weird thing is that ATI made (2) different PCB boards that look identical, why not use the exact same card and denote the difference with a white sticker for the bracket swap... even the "Rage 6 73501" chip is an exact match... so why 2 different production runs with 2 different etched in parts numbers... weird