If you have 15" wheels, the correct replacement gear is Orange, and has 20 teeth. If you have 16" wheels, the correct replacement gear is Tan and has 19 teeth.
As far as a place around here to have it calibrated, the only thing I can think of off the top is to call AAA in Ventura (they're at Victoria & Ralston, 644-7171), and ask them if they know of a place. I know they have free services like that every couple of months in their parking lot, but they probably know where to have it done locally as well.
Take care,
-Chris
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