These will all work, assuming you have a .223 Savage Stevens 200, short action, centerfeed action:
There are others ...
I just bought two sets of bottom metal from Savage, along with a .223 and a .308 magazine.
I also found out the CDI bottom metal would work with the AICS .223 or .308 magazine.
CDI Precision Gunworks bottom metal
Had I known this up front I may not have bought the factory Savage bottom metal ...