Here ya go:
https://gun-guides.com/Perfect-Adapter%E2%84%A2-Optic-Mounts-for-Savage-O-U-24-Shotguns-by-Gun-Guides%C2%AE-BACK-IN-STOCK-p83298188
These are the ones I bought. Solid mount. They sell in package of 1 or 2.
It’s the SAME Weaver mounts we were discussing above.