GMC parts can be a little harder to find than Chevy, but they seem to be available on E Bay if you are patient, or repops thru the suppliers mentioned previously. You will likely end up sourcing most stuff out of the US as not many suppliers north of the Border, and their prices are quite a bit higher. I was fortunate in that I live close to the Washington state border and can have stuff shipped to a depot in Washington, then run across and " import " it myself. First few things I bought were shipped via UPS and they just kill you with customs fees !
