To the best of my knowledge, All long actions (not counting the old intermediate actions of the 70s/80s era) use the 5.0625" spacing. Assuming that you are using stocks intended for a top release action, then if memory serves you can use either a centerfeed or a staggerfeed action interchangeably if inletting for a dbm from a blind mag stock. I think (key word there) that for blind mag interchange you can put a CF mag in a SF stock but it requires some shimming to keep the mag in place, and you can put a SF action and mag in a CF stock but in some cases it requires some material to removed from the front of the mag well area in the stock.
Now if you are wanting to put your top release action in a newer bottom release stock, then I am not too sure. I am sure you would need to inlet the stock for the top release lever, but beyond that I do not know. I have not yet owned a bottom release rifle so no first hand knowledge there. Hopefully one of my knowledgeable Barrel Nut Brothers will chime in with that info.
If you need a replacement synthetic stock from the SF era for your action just PM, I may be able to help.
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