It’s an sti. Used to run them on my wife’s race buggy because they were so cheap but then realized the beadlocks ring design loved to slice her sidewalls and destroy the tire lol
We have several caps but none in STI brand. We talked to some of our guys and they say a ITP and a proarmor will work on the wheel. I have one Proarmor cap that matches and should work.
I sorry to get back so late. No full set at the time. I sent you my number. If you get time give me a call. It is easier than email at time I’ve got a benefit we are doing every weekend till October. I will help you out any way I can.