Yeah, that GBP site is awesome; lots of cool products, amusing descriptions, and best of all-- tons of detailed photos of the parts/frames themselves, plus photos from all the events they run in cooperation with the retail shop: Atomic Cycles.
Another must-visit site for klunker enthusiasts is the Mr. Tick site. I'd put up a link, but it'd violate forum rules, as the entire site is riddled with profanity. I got a stem and some canti-posts from Mr. Tick, as well as a "Klunkin' Aint' Easy" t-shirt.... all of it is quality stuff. FWIW, the Ticker appears in the GBP retail catalogue, and i suspect he may be the machinist who turned out those seat clamps....