The sear, sear spring and the longer trigger hanger pin is the only change. You need to have the side of the receiver milled to do it correctly. Some have bent the side release over but there is a chance it breaks off and is a hack In my opinion. I don't have the numbers sorry.
Edit: lust looked these up on Numrich. Do not know if these are the accurate savage numbers or they are Numrich's #'s.
Sear - 139590C
Spring - 139590C
Pin - 1348790F
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