On an old Mauldin paver , there are wheels that engage the outer dual wheels of a dump truck.. This keeps the paver and truck moving in unison.. This attachment has been cobbled and remade over the years.. The wheel that engages the outer duallies is a rubber clad wheel approx. 5" o.d. and an i.d. of 3" and 1-1/2" wide rubber surface.. Due to the fancy aluminum wheels used on dump trucks now-a-days , it's got to have rubber on the od.. Any ideas where to look for such a critter ?? I've been to all the websites I can think of .. Surplus center , etc..Maybe , If I knew the exact name of that wheel , I'd have better luck finding it..