You'd need one stereo jack and one mono jack. The stereo is for the instrument side, so that the battery isn't being used until a mono phone jack (a.k.a most guitar cables) is inserted which connects the ring to the sleeve; i.e. completing the circuit for the battery.
Red or yellow Fasel inductors are generally the most popular and associated with being "classic". You can do a Google search yourself for information on the "Red vs. Yellow" inductor.
Almost any 3PDT stomp switch you find will ultimately come from the same factory (or factories) in China. StewMac, while expensive, usually is reliable when it comes to quality control on such switches. Or you could just get a cheaper lot on eBay but get a few switches and test for the most solid switch.
Now that you have your answer, I'm going to share my opinion and say you're stressing over little things that don't really matter all that much. I consider Vox wahs to be solid units straight out of the box, true bypass isn't all that it is made out to be, and the different inductors are more of a minor wah feel/response attribute than an overall sound attribute. I'd only suggest modifying the wah if you actually want significant changes such as a different Q factor or wah frequency peak range. If it is a newer wah anyways, the buffer is actually helpful and true bypass is unnecessary unless you're running it into a fuzz pedal or you want an LED light for the wah. If you still want to make these changes, then by all means proceed.
EDIT: Also, actually check inside your wah to see what is actually in there. Vox and Dunlop have made so many changes to their wahs over the years that it is best to see what you have before even buying any parts. For example, when I bought my standard Dunlop Crybaby it came stock with a red Fasel inductor. Quite a few people had actually bought wahs, wanted to upgrade them after reading that they HAD to have a red Fasel inductor and became unhappy with their wah, only to buy a new inductor, open their wah, and find out their wah already had the red Fasel inductor all along! I think a lot of it is the placebo effect, and we get so caught up with tone-chasers on internet forums that we forget to just use whatever gear we have to its full potential.
