Hi guys, I am building a custom chopper with a Nighster engine. I'm desperately trying to find any pictures of how to mount the nighster engine on the frame (rigid) without rubber inserts. Are there any adapters or???

Thanks a lot for your replies

 

I suggest picking a frame and the maker will supply the info you need. Searching for sportster frames should provide plenty of results.
Personally, if you could mount in a custom frame using the rubber mounts I'd strongly consider it.