1" bore with the drum brakes. 1 1/8" with discs.
I've seen two drum brake rebuild kits on ebay over the last year. Both were over $85.
The kit you mentioned above is for a Bendix MC used on the B bodies. Not the same as the Delco unit for the A bodies
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Ed
1968 GTO (Thanks Mom)
2006 Silverado
2015 Chevy Express 
2024 Cadillac LYRIQ
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