I know that thee have been several pots over the years about sourcing a replacement roller. The answer is usually that no replacement is available and that you have to buy a bigger roller and cut it down to size, which I have done twice in the past. They seem to last about 3-4 years before breaking down. Well this weekend we were at Cowichan Bay and I went into a little marine store there and what do ou know - *they had them in stock. Sea Dog Line - Bow Roller Replacement Wheel width 1 3/4" part # 328059-1. Fits fine and works good. They had 3 in stock ($8.99) so I bought them all, one for a freind and a spare.
Steve
Steve