I had printed a GPU display stand but realized I have no shelf space. So I decided to heavily modify the stand design I printed to work on a Wallcontrol metal magnetic pegboard, which uses ¼" peg holes. The ¼" peg holes should also be the same as standard pegboards from hardware stores and ikea. 

To help you identify if you can use this on your own pegboard, 
The spacing between the hooks is:
- 4 inches between the far ones
- 2 inches between close ones
- A hair over 6 inches from the hooks on the two ends

I printed it in PLA+ with 15% infill (grid). If you are wanting to mount a bigger heavier graphics card, I would advise a stronger infill percent and pattern. It seems to hold this Nvidia RTX 2060 FE just fine though. I did enable tree supports as well.