Dave: I have swap locks (flint) on many of my side locks,I can truly say the early t/c locks (Flint) from the 70's are a tad bit larger then the newer ones.
I also seen some fitting is required on stocks that came from the factory as percussion.
I love the PA HUNTER STOCK I now have 2 of them one is the newer 45 cal. flinter and the other was a early hawkens flinter also.
That renegade you are looking at I must have it now around 4 years was real lucky to buy it from a guy that never completed it and was sitting in a basement for some 30 plus years.I did all the wood and metal work on it and used LMF to turn the parts brown