The PN you seek is R 258 M...Parts Depot doesn"t have them so you"re going to have to go to your John Deere Dealer and ask them to see if any other dealers have them. That one dealership that advertises in Green Magazine would probably be a good choice.
You didn"t say WHICH drill you"re working on however the Part Catalogs for the FB, FB-A, FB-B and FB-C are available as a free PDF download from JDParts.com.
I have an FB and I would upgrade to the rubber tubes. You can get what Deere is selling now at TSC and cut to fit.
PS Please take the Caps Lock off.