I have been looking for something for my 77/44 and unfortunately can't come up with anything in Canada. The ones in the US will not ship up here.
There is a company in Australia that is making the same one, and they can send it out, supposedly, but I have not tried. The brand name one they also carry, but can only send out the one they make.
Burris, I think makes a bit of an adapter, but it is 2 pcs, for front and rear area, but I have been hesitant to try those out.
For my no 1 I had the option to order a new rail, as the hole spacing lined up to the factory rail, so I went that route for it.
For the 77/44 I ended up getting the offset rings, and running it that way for now.
https://www.burrisoptics.com/mounting-systems/rugerr-to-weaver-base-adaptor
I did have an NCstar one on a ruger 96/44 I used to have, but again don't know if they are available now, or it they would fit for the 77.
https://www.ncstar.com/optics-acc/accessories/ruger-accessories/mrubv2-mntrugmini-14-30wvrblkv2
The one I really want. https://www.jackweigand.com/Ruger-M77-MKII-Rifle-Scope-Mounts-No-Drill.html