Farrel bases - with taper, doesn't have a good look.
Murphy Precision bases - with taper, has a good look.
Talley two piece -- need Talley or 3/8 inch Davidson style ring
You can use two Rem 700 rear bases if I recall correctly - No taper
You can also use a Savage two-piece or a single rail mount, with taper, but...you may need to add one additional screw hole to the mount, with counterbore.
All above assuming you have a 1.350 inch diameter action.
I think I have a Davidson-style one piece, zero taper, if you decide you need it. You can add a 0.005-0.007 inch shim below the rear of the Davidson to get your 20 MOA taper.
The original Nesika single piece and two-piece mounts, with taper, were the best and nicest. Next would be Murphy's Precision, just in case looks matter to you.
Al Warner can cut you one and get it to you for reasonable money.
Good luck with your search.