Hey there, your best bet would be to buy one off line, I take it you must have a credit card because your using eBay, you might have luck getting one at an auto zone if theres any around you, i picked up a dual master cylinder for about 18 bux, i Buy most of my parts from a local mustang shop, Dallas mustangs, search them up on the net. good luck.
I did a 65 Mustang and ordered parts from several suppliers, I had the best results and best service from NPD. The staff will answer questions and thier return policy is one on the best. My opinion. Gary
CJ` S PONY PARTS IN PA, MUSTANGS UNLIMITED IN CONN, ARE BOTH EXCELLENT SOURCES FOR PARTS. TRY UPDATING TO A 67 DUAL SYSTEM MASTER CYLINDER FOR A SAFER RIDE. EASY BOLT- IN MODIFICATION.
I have a 66 that I'm getting ready to part. It has mostly original factory parts. The C-4 has been professionally rebuilt and the engine has be rebuilt. Only 25 miles on it. It has been sitting for over 10 years.
We live In Dallas Texas and use Dallas Mustang for a lot of parts. They also have a catalog and are REALLY good with customer service and knowledge of all years Mustangs as well as ship and sell all over the USA.