92 CAD dana 44 question

Just bought a 92 Ramcharger. Front brakes needed replaced so I figured I'd repack the bearings while I was at it. When I removed the hubs I noticed only on the driver side there was a let's call it bushing that goes behind the puck inside the Hub. The passenger side did not have this bushing. At first I thought I was a piece of exhaust tubing with it cut in half. Just wondering is there supposed to be one on the passenger side as well? And what the heck is this thing called?
Thanks
V10

Parts book calls it "drive gear spacer"- mopar 4137764

Book calls for 2 of them so it should be on both sides. Its on both sides on my 88 and 92

Yes both sides.

Thanks!!! Where did you find the drawing and parts listing at?? I could only find 94 and up diagrams