I'm about halfway through a custom bike build, and have decided to go with an underseat rad for various space, looks, and functional reasons. It's gotta be cool, Britten did it right?

Anyone know a good place to get a quality custom-dimension radiator make locally?

From my back-of-envelope calculations, I'll need a roughly rectangular shape with slight trapezoidal taper toward the neck. It looks like a cross-flow design will be ideal, as both hoses should connect at one end. About 5" widening to 6.3" wide, ~1' long.

Otherwise i'm back to prowling junkyards and craigslist for a stock rad to retrofit.

Thanks in advance for any help!