Speedwerx is still in business, you can try them. I'm sure an ADA girdle kit would be cheaper and the O-rings should be available locally. I thought the Speedwerks domes were the same as Pro-Tec, Blowsion and Pro Design.
We still have all the o-rings available for our head kit. I don't have all the pieces left for our girdle kit though. You should be able to use a ADA gridle kit without any problems. As far as domes are concerned, they are the same as Pro-Design, Wamiltons and Blowsions. We still have a lot of domes left if you're looking for any.
Speedwerx hooked me up, I got an O-ring kit from them, but then simply carried it to my local O-ring dealer and loaded up on some for future needs.
The domes are not the same as Riva so I assume niether are the O-rings. The domes are the same as cool-head, UMI, Greater, and many more. Speedwerx is reasonable for cutting your domes to your specific needs as they did for my 86.5mm flattop.
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