You could try the RFQ section of cnczone. You will likely have to supply some sort of drawing with measurements.
http://www.cnczone.com/forums/rfq-request-for-quote-/?s=7c84f625750bb919c5536aa2f67594d2
Good luck.
http://www.cnczone.com/forums/rfq-request-for-quote-/?s=7c84f625750bb919c5536aa2f67594d2
Good luck.