Three to check out.
Ken Farrel- this is the one i purchased. Had to ahev the gun smith fit it when it arrived. It was about .001 too long and hit the bolt when closing. Had the gunsmith mill the end off to fit.
Near Manafacturing--They were expensive but great quality i hear.
Seekings rings and Bases--When I puchased mine he did not have a pattern made yet. If he did I would have purchased his.
I hear they are the same as a Rem action aswell. Might want to check the hole spacing on all 4 holes before purchasing.
Cody