That's a good question and I'm really not sure if they are interchangeable parts wise, I would have to do some research on that. I had manual brakes on my '81 D150 Custom and when I did it, I replaced the whole master cylinder with the OEM part, but you're right, parts for those are increasingly hard to find these days. Let me look into it some more and see what I can find.
Thank's I'm having trouble finding some Brake parts for my 85 D100.
?:I need to know if the power master cylinder and Manual MC, are the same on my truck. If they are 1 1/8" like mine and if I can use the factory unit, I am aware
of the ratio and the math on that for 6-7will give me plenty of brake force, I'm in need of the Rod assembly to replace the one in the booster! any help would be great!