The UA and VA are different sizes and a lot of parts aren't the same. Different pistons, crank, cam, rod bearings, valves, gaskets. The cam gear seems to be the same. Yale part # 9002848-49. I think it's about $60. I wouldn't know if you could swap out a UA with a VA. As for FE or F2, no way. If you call a Yale dealer they should be able to get any parts. I have a parts book if you need any numbers looked up.
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