Bob, I think these pic from a couple of my resource books (1942-46 Shop Manual and Master Parts Price List), along with an edited screen grab of your pinion gear pic may shed some light on the subject. I think you have all the parts, the bearing locking sleeve (ring) is just in the wrong place on your gear (red arrows show where your part is and blue arrows show where it should be). It needs to be moved to the forward position to press against the back edge of the front pinion bearing. Your sleeve (ring) doesn't seem to have the steep edge like in the book pictures, but the beveled tipped retaining screws just need to rest against the lip of that ring to push it forward and hold the bearing and gear in place. It doesn't need to rotate as that's the bearings job. Hope this is helpful.
