The casting number on the wheel cylinder is a Delco Moraine #, I can't see the dia. but looks like 1.125". You should be able to find kits for them. I had to press mine apart with the vise and thought one of the pistons was too far gone but after soaking the pistons in hot vinegar and the cylinders in muriatic acid I found them in good shape. Hone, rebuild kit, paint, good to go.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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