Blackberry,
CD is right about the screw and eye on the bottom of the faceplate being a replacement guide for the one that should be there. Normally the guide is a small wire like affair riveted to the face place. Looks like at some time yours got broken so someone improvised a replacement. I have 66s from the -1 to the -18 and they are all the same. I can take a pic for you if you want.
On your motor, the rectangular piece of metal that is screwed vertically to the motor mount bracket should be spot welded to the body of the motor in one of the two unpainted places. There should be two of these on the motor but it looks as if they were broken off at some point. Probably cos someone overtightened the belt, or dropped the machine on it's back. At any rate, there are other motors that have dual screw holes for the mounting bracket. I can take pics of this too if you want me to.
Joe