I can't see the pics but there is not usually anything behind the yoke. Just shims behind the narrow end of the front pinion bearing on the pinion gear. Make sure the seal housing (the case) is not scratched where the seal goes. If a seal puller is used and no care taken it can put a decent gauge in the housing that needs to be removed or smoothed.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.