Alloy metal seat tail?

Does anyone know who makes an alloy rear tail...like Thruxston style? I can only find fiberglass or plastic. I want my bike to be all metal. I could have it made locally, but the guy I know would be very expensive. I can make the seat pan myself if none comes with it.

I think that they're pretty much "one off" custom made items. Ask worntorn of he'll do one for ya

NRP Norton Commando Semi Dual Aluminium seat unit.

http://www.nortonraceparts.com