This place has cheap brake pads and shoes for multiple 3 and 4 wheelers.
http://www.shadetreepowersports.com/...and-shoes.html

I have a few questions though. What makes rear pads for 84 and 85 Tecate different? Also what makes TRX70 and ATC70 brake shoes different? Both bikes look the same from the rear. I think I'm gonna grab a set and hope they fit an ATC. If not I have a TRX70 as well. If I knew for sure they'd fit an ATC I'd grab several sets.