Stop in for a cup of coffee

What size 14? The factory oness on my 74 will work if it is the stock single piston caliper. Think Mitch has them now on his Roller.

Yes, 14's. It's that disc kit I installed so not sure how that compares to the factory calipers... think it's GM? Or at least the master/ booster is.
Those early steels I have now won't fit.