I've purchased a '67 (BF) Dual Showman and it doesn't have the stock OT. It has an export OT so that it can be used in other countries. I'd like to get a stock one in there. I see that I can buy replacement OT's at places like Mojotone and Weber. Any suggestions or recommendations as to a good place to buy an OT? Should I be looking for an original; are originals (NOS) even available?