I converted to rear disks on my '65 and used a kit based on the early '80's El Dorados. The parking brakes are terrible on those, so I switched to a Corvette design where the disk rotor has an internal drum for parking.
Mine is a Wilwood kit, but you can probably find them from another manufacturer.
It's an earlier Corvette design that works with 15 inch wheels.
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 1965 Pontiac LeMans. M21, 3.73 in a 12 bolt, Kauffman 461.
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