This is not correct. The newer laminated ("B" for Boyd's) stocks will have everything that you need (TG, Mag plate, Longer action scews), but they factory pallet wood "G" version stocks do not.
Three problems;
1. The stock that you say is $20 more is a "G" version stock and does not have the parts that you need.
2. The Savage factory parts are really crappy... the TG is useable, but the mag plate is a flimsy joke... better off to pick up the DIP package for those parts. The parts that Boyd's sells are sourced from Savage, so they are the same cheap parts that would come on a "B" version gun...
3. To make matters more complicated there are some "B" version guns (mostly package guns) that have surface mounted TG's and Mag Plates, and these will not fit the Boyd's stocks, which require the "inletted" components... Savage does have the correct parts, but again they are not of good quality (don't ask me why they don't fix this problem?).
DIP parts that you need are here;
http://www.diproductsinc.com/Detail.aspx?PROD=353051&CAT=3602