I have my doubts the v8 rockers will work. You might look for a core motor for parts. A lot of junk yards may have them. . Craigs list has some that are available. Did you call Crower to find out the scoop on the ones they sell? Most likely they may need the 3/8 hole. If that's the case you might be able to find a 3/8 to 5/16 stud that could work.