Dual Master Cylinder - What Years

[jbgroby]

I had this information awhile back but misplaced it. What I have and want to do is the following. I want to replace the single reservior brake master cylinder with a dual chamber setup so I have seperate lines going to the front and back wheels (incase one fails, this is a safety feature) .

I have a 1960 GMC and can't remember what years to ask for at NAPA. "I thnk it was froma 72-85" but can't be sure and don't want to mess up

I'm sure that someone else has done this swap? There one new setup on eBay with 2 days left for a great price.

Thanks
Jake