Atwood 8531-II Intermittent Burner Question( Photos Added)

Thanks Doug, I will check that out.

Tried to find on google, but got confused. Here is my 8531-II and my spare 8531-III I got off a guy. He said it works (?) I have already stolen the burner off the III to use with my II.

The III has an on/off switch not on mine. Mine has a cover for the control board. What are the parts seen mounted going from left to right on these things? Not sure which is the hi-limit switch to swap. Be handy to know what the other things are too!

Thanks. My II first, then the spare III