Beautiful work, Jim! Just to confirm, Tour Max is not a manufacturer, it's a house brand label used by K&L Distributing. Tour Max carb boots are made by ARS, the original equipment manufacturer used by Yamaha. Tour Max boots can be ordered through any shop with a K&L catalogue (that's most of 'em). Their seal kits are also made by ARS (also OEM for Yamaha).
Great research job on the carb parts, 5twins! Lately I've been buying jets and other carb parts from Niche Cycle. They offer a choice, clearly labeled, between genuine Mikuni and knockoff brass, and their price for the real thing is what others are charging for Brand X Chiwanese crap.