Hello.

I just checked my seloc for engines your year and horse power and there are pictures in there.

The right dimensions you can get out of your owners manual which is available online and in your local library together with the seloc and clymer book.

I am sorry, but at this point in time it is impossible for me to attach the pictures here.

If you are trying to refill the pinion gear,you may find it easier by first loading the thing with grease that way nothing will fall out