Spacers between seat tracks and seat bottom?

[flyingskibiker]

I rebuilt/recovered my bucket seats and tracks.  When I took the tracks off, I found some kind of spacers under the passenger's outside track.  There was one regular washer under one end of the inner track.  I checked the driver's side bucket.  There is only ONE spacer on it!!!  Are these original?  What were they made of?  Seems like some kind of rubber washers stacked up...  1968 SS Deluxe interior if that matters (but the seats are '67 Firebird).  Thanks!

[77thor]

My car DID NOT have those.

[flyingskibiker]

Yah, I don't see them in the Body by Fisher book, either...