1-1/2 bore=Raybestos WK104 (fits WC4511)
1-3/8 bore-Raybestos WK103 (fits WC4571)
For NAPA rebuild kits, just drop the WK. NAPA Canada retails at around $27 per kit. I can get the complete wheel cylinders out of the US for around $10 more. But there is merit to what Phil says about sleeving then only ever having to replace the rubber parts. The low Chinese supplied prices will not last forever.
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