The next iteration included a removable bellhousing transmission that still used a four-bolt flange on the back end. Shown is a close-up of the four-bolt flange. While there are aftermarket kits to allow adaptation of this ’case to the six-bolt style that we are more familiar with, generally you are better off starting with a later case if you want six-bolts. The conversion for this four-bolt case is longer than starting with a six-bolt case. This transmission is sort of an odd duck to find, because not too long after came the one to the right.