K2 - F2 Hyd. Unload Auger ??

u-joint upgrade and beefing up the elbow some. While in the  April 1997 Gleaner Parts Catalog for the K2, I see listed a seal P/N 71320889 for the elbow. Since I've upgraded everything else on the machine, figured might as well do that while I'm at it. When I received it along with some other parts, I couldn't figure out where it went on the elbow asy., and laid it aside. Ran across it today in the shop, so here we are. In the illustration it looks like an angle shaped piece, maybe 2 feet in length with 4 holes on one side. What I received is a piece of foam 1" square with adhesive on one side, around 18" long. My guess is that the seal would have been used to keep dirt out of the swivel chain. I still don't know how or where this piece of foam listed on the tag as "Vibration Seal" goes. Can someone enlighten me?

Yea, I was thinking keep dirt out of balls, but wrote chain. So it would have been inside the assembly then? Did all of the swivel augers have them from the factory at that time? I wonder why it still is, or ever was offered as a repair part. Also why it's labeled vibration shield??  Cost was around $7 for me to find out what it was. Thanks for the info.