I actually built my 260 Rem about 2 years ago. What I did was called Savage directly and provided them with my Serial Number off my rifle, and told them I was going to be swapping out my original OEM plastic stock with a Boyd's Laminate stock. I asked for the "Bottom metal for wood stocks" which comes in plastic or actual metal (I went actual metal including a new trigger guard). It was as easy as that in my case. The hard part was pillar bedding the stocks (have a Prairie Hunter on an Axis also).
They may have been out of parts maybe??? The Pro varmint is one of the most popular aftermarket stocks for Shooting LR, Bench, Prairie Dogging etc...