Can anybody ID this Master Cylinder?

I’m guessing you have single piston calipers on the front? These masters are used a lot on disc conversions although most go with the 7/8” bore master for less pedal effort.

Thank you Sir,
I haven't pulled off the calipers yet to see if it was a single or dual piston and though I wasn't planning anything at the time I took this hazy pic today I can clearly see two rubber boots on the caliper. I'm pretty sure Two boots = Dual Piston correct?

It has been a while since i've driven this car and do seem to recollect it taking quite a bit of leg to work the manual brakes so your comment on the 7/8" bore requiring less pedal effort certainly got my attention. I like the idea of less pedal effort but also wonder if the currently in use Geometry, Piston Rod? etc., would work if I changed over to just the 7/8" bore MC.
Though there's no shortage of parts stores around my area, the days of knowledgeable staff seem to be a thing of the past and all the college kids populating my local stores can do is look it up on the CPU. Hell, I had to go to four different stores last weekend just to get a 180 degree thermostat for the RB, one kid even asked me what's a 440?

Do you know what (Yr, Make, Model, Eng) I would be asking for at the local parts store if I were seeking this 7/8" bore MC?

*****Update, after reading the above Brake Tech article it doesn't appear Ma Mopar produced a 7/8" bore MC, at least not up to 1975 anyway.


69'Cuda Unmothballed Brakes 12.15.19-11.jpg