[Richard (EV8G)]

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IF they are Ford/Merc/Lockheed brakes, the rear wheel cylinders are the same 39-48. The fronts could be 1-1/4" forward piston diameter (39-41) or 1-3/8" forward piston diameter (42-48) but the earlier brakes could now have the larger cylinders, since for a long time, the new cylinders have only been available in the 1-3/8" size.

If any of the cylinder bores are badly pitted and would therefore require alot of honing to clean up, you should consider buying new wheel cylinders. Also, the rebuild kits do not come with new pistons and often the old pistons are nasty.
Sometimes they are so corroded, they cannot even be removed. If the cylinders are honed too much, the seals will not seal and you will end up with
brake fluid on the new linings... and will have wasted alot of time rebuilding the old cylinders and money for the kits and new lining.

Same goes for the master cylinder.

I would avoid the new South American cylinders.