Kelsey Hayes caliper pistons

JGC403 said

Sorry to hijack but are these calipers worth installing on a car if it originally came with drums; or is it better to go with the sliding caliper brakes?

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The caliper and rotors are available as replacements (see rockauto, just eat the core charge), but you also need the special spindles and hubs, plus the unique wheel studs. Good luck finding all that. A rusty set commands $200. A member here has sold rebuilt sets for ~$750.

A slider set (1973+) is getting hard to find in the junkyard. You can use spindles from Aspen/Volares, but those are getting rare too. You can buy new slider kits for ~$600 on ebay. Scarebird is the best affordable approach, and uses your existing spindle, as does Wilwood and others. Read all about these choices in past posts.