New ones look like they'll fit the right side but almost an inch thinner?
Left side is a different style. Single bolt to the K and single onto block bracket.
2303 driver's side and 2304 passenger's side. They're tough to find. Here is a nice pair of high quality poly mounts. They're proud of um though. https://polybushings.com/pages/2303-4.html
I *think* I have one of those in good condition. Might have come off my '67.
Let me know if I should look. I can check the Engine swap chapter to see if the p/n changed when the K-frame changed.
I know for sure I have an early transmission mount with two studs - that I bought new.