Closing the loop: I was able to order wheel hoops from Jongbloed racing wheels in California for my Formula 43 wheels. Ryan was super helpful. They spin their own hoops and could do the 30 bolt pattern to match Formula 43. You can also probably buy them from Fikse as well but I reached out to them and didn't have any luck with a call or email back. I went with 1.5" outer hoops and 9" inner hoops. Should be arriving in the next week or so.