These
https://www.talleymanufacturing.com/product/steel-base-for-browning-bar-blr-bpr/I think my bases are actually Browning branded Talleys, IIRC. Same bases as above. I got them pretty quickly from Browning.
https://www.browning.com/products/s...rings-bases/two-piece-bases-blr-bar.htmlDon't worry if the images don't match. The Browning-branded Talleys and the Talleys are indistiguishable from one another.
Note that you can only use Talley rings on the Tally bases.