Nice big diameter ceramic cap, without paying high prices for a reproduction like what Acme sells. Not that they sound all that different than a poly-whatever cap, but they're a good fit in a Tele control cavity. No shoehorning required.
Warmoth or Stewmac when I can't find what I want, but depending on where you are Radioshack should have what you need. (Not my Radioshack because in Costa Rica you can't find jack!!! I hate that!!)