I've been researching different parts to build the various components of my first HHO generator, and am ready to start purchasing everything soon. Thankfully, I work at a NAPA Auto Parts store, and I should be able to get almost everything I need through them.
NAPA has a line of parts called "BALKAMP", which is really more of a blanket of goodies, than a specific line of parts such as starter, altenators, etc. In Balkamp, you can find everything from chemicals to mops to fasteners to... well.. anything, almost. So, as I purchase things, I will make sure to list all the relevant part numbers - a NAPA shopping list, if you will.
In the meantime, check out the online NAPA catalog..