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Wagner 15306 is what we use and we'll need more. If you had nothing but time you could do a little experiment and try it out around the yard.I found this thread. It was late last night and I guess I overlooked it.
http://www.steelsoldiers.com/showthread.php?79598-GMC-wheel-cylinder-parts
Plowboy...are you using the Wagner 15306 that you posted a picture of? Those are what I ordered.
If I am not mistaken, Nattileather used the 1-3/8 bore?? Or did I read that wrong.
Otherwise it's change out the fronts to 15306 or hunt down 8 - 1 1/4 for the rears, which is less work. Can you find the 1 1/4" cylinders?
Looks like we had a little water in a wheel cylinder over the winter. It froze and possibly popped a boot spilling stuff all over my shiny rim paint. When I bled the lower left wheel cylinder it was a rusty red squirt at first. We're tearing through the TM's PM's and I'm sure we can use some more large bore if you want to make them go away.
Now that I'm storing outdoors I also see the need to change to a better brake fluid or a heated shop.