A few pictures of one of the hangers I had kicking around from that warehouse with many others styles.
Rubber is only 3.5 inches long so wont help you.
Rivets same as used on many Mopar hangers, noteably regular E-bodies as seen in last picture....and NO,.. those aren't available.
If you give me some time till I get back there, I can get plenty of correct rubber size on big ol NOS truck hangers they have, that can be cut to size for your AAR hanger