Qwerty seems to like Vesrah parts in that thread and frowns upon EBC.
Fourcycle wrote "Getting rear brake pads can be a pain for the older models. There were several changes to the rear brakes throughout the years. The brake pads for my â€™90 are no longer made by Yamaha, leaving only aftermarket. The PO of my TW had installed some Yamaha pads designed for a more recent TW and that was a big mistake. Even though the pads had plenty of life in them, the metal portion of the pads contacted the drum and wore a deep grove into the metal lining. It was trash and I had to buy a new drum and aftermarket pads. With a casual comparison, the two sets of pads looked like they would work and both fit just fine.
More changes have occurred to the TW over the years than people realize and many of them are not immediately noticeable. Refer to the Yamaha parts fiche to determine the correct part number for your model and then verify it with whatever you want to buy of eBay or the like. Especially with engine and running gear parts."
As far as where to buy parts see