Those numbers have been superseded. New #'s are at the link below.
If you click on the individual part numbers, a dimensional description will come up, including durometer.
On the other hand, keeping it simple, the CNH price ranges from $.53 to $1.94 each.
Looks like Messicks have them in stock, if you don't have a dealer nearby. You could have them at your door in a couple of days.