Master cylinder '60 Dart Seneca?

Any idea where I can find a single master cylinder for a 1960 Dodge Dart? Haven't been able to find one.

Found this one on Ebay, http://www.ebay.com/itm/Raybestos-MC3433...#ht_1311wt_1139

but it doesn't list the 1960 Dart in the applications. Looks the same on the outside.