This is just a really unique part that just came in. It is the rubber seal at the firewall for the steering column and clutch rod on the 1971-73 model Mustangs. This part is almost always torn or dry-rotted and needs replacement. Up until now, it was almost impossible to find a replacement. This one is, of course, unique to the manual transmission equipped cars due to it's "built in" clutch rod boot. The same seal for the automatic transmission equipped cars is just a flat piece.