|The MGA With An Attitude
Dunlop MASTER CYLINDERS, Good and Odd - TC-208D
Photo above shows the original (normal) Dunlop master cylinder. Notice location of port on side, hex head screws on top, and short rubber boot on the end.
This one came up on eBay in September 2010. Notice the port is located farther forward, top is attached with flat head screws, and the rubber bellows is not at all like the Twin Cam type part. So far no one seems to know the original application, or if this may be an aftermarket replacement part.