I am pretty sure Bell+ Carlson and MPI offer 1917 stocks.It is good to know if your guard has been straightened or is original.The B+C stock should be pretty much a drop in.The MPI's require some work.You had best be skilled at glass bedding,etc.Haven't used one,saw them at shows.
A synthetic stock is not always lighter.Look before you leap
I have not used these products.This is not a recommendation.The MPI's I saw were pretty rough and would take a lot of work