Kelsey Hayes caliper pistons

Good resources. Anyone know where to get stainless steel pistons? And is it difficult to hone the bores? Should this be done by a professional?

The bores usually need little or a touch of crocus cloth. The hardest part to clean up is the groove for the boots.

Some pictures in this thread http://www.forabodiesonly.com/mopar/showthread.php?t=299221
and a link to a store selling SSBC brand stainless pistons for the '67-72 calipers
https://www.npdlink.com/store/produ...brake_caliper_stainless_steel-103845-350.html