At first, I downloaded and printed a few copies of https://www.thingiverse.com/thing:3363383 for some computers we're configuring at work. However, the computers in question have their PCIe slot right up against the power supply, so this bracket wasn't going to work. I thought at first I'd just modify it, but OpenSCAD was having issues splitting it into pieces and reassembling it, so I ended up recreating it from scratch with the connectors reversed. I also placed the VGA connector a little higher (because the cables on our cards are short) and redesigned the attachment tabs (?) at the top so that (1) they're in the standard location and (2) supports aren't needed for printing.

This was designed to work with low-profile nVIDIA-based cards that have the HDMI and DVI connectors on the board and the VGA connector on a short cable.