Wheel cylinder bore size question

I do have power brakes. I'm not sure if they had manual brakes on Ramchargers. I think they were all power brakes.

as recent as 87 seems to some of us...lol. You would be surprised at how many things were options then. Those Data books were big ! You could still order almost anything ! We were still ordering slant 6 , 4 sp , rubber mat , vinyl seat base trucks... Radio and heater deletes were still available. Steel wheels with poverty caps were common.