i have an iron horse 04 sgs dh pro, just got it a month ago, what can i use to replace those rubber bump stops that come on the boxxers, they are already cracked and splitting so what should i use to replace them. or can i buy them. i think i've seen a bike that used a little round rubber piece, like the kind that go on the bottom of furniture, on the downtube where the fork contacts their bike. thanks for any suggestions.