The Stovebolt Site Forums The Shop Area Engine Shop motor mounts

I am looking for motor mounts for my 230.(1963} I bought a pair from Advanced Auto everything lines up, however the bolt that joins the mount to the frame is much smaller. I went back to the store and they offered no option other than returning them. do you know of a direct replacement. I can use a smaller bolt but being there are only two bolts I kind of think bigger is better

Thanks