Thanks Christo! I later realized the idenifier was on the edge of the pots, not the back, and concur! Now I just have to find where I can get one that small!
If Roland in the US or Canada is anything like my local subsidiary, they will say that they don't have any parts for older pedals. Giving them resistance values doesn't work as they can only look up Roland/Boss part numbers. They were unable to find me a knob for a CE-2 so I had to tell them it was for an SD-1 and then it was ok