"New reproduction 1967 Corvette with J56 heavy duty brake option front brake caliper piston. Includes plastic insulators as original. Sold individually. 4 required per brake caliper."
Zip claims to have these repops. Mid America too. And, eBay. Duntov sells their titanium version.
Not sure that is of any use.
I did look into machining titanium and decided it was doable for a hobbyist.
“If you already have your calipers and just want to change to our pistons, you will want these second design improved titanium insulators. We designed them for the road racer who has had enough of brake fade caused by boiling brake fluid. They are expensive, but so is going off the track and hitting a tree. Included are an axle set of seals, dust boots and O rings.”
Free Freight