Dies compatible with Buckleguy hand press

[Mherbs]

Hi! I’m new here but hopefully someone can help me out. I recently upgraded my hand press to the one sold by buckleguy. I use a lot of their hardware so it made sense but the one thing I don’t use from them are their rivets. I use the ones from Tandy with 8mm caps. I bought a die for these rivets on eBay and thought they would fit the press and while the bottom did, the top die had a different thread size than the press and I could not screw it in. I use rivets 95% of the time with my press so if I can’t find a compatible die I’ll have to return this press for something else. 
 

Has anyone successfully bought and used a rivet die from a separate seller with the buckleguy press? Thanks!!