I ordered a Raybestos MC39166 unit from Amazon for about $75, but it was taking 1 to 2 months for delivery, so I cancelled the order. I then went out to rockauto.com and order a Dorman unit M39166 for less than $45 with shipping.
Well the Dorman master cylinder from rockauto.com was also out of stock. Customer representative called me up to explain that there was a mistake in the system. He talked me into a Wagner unit MC101252. Roughly $65 with shipping. Hopefully it wil be here by the weekend so I can test this master, weather permitting.