KH piston dust seal fixable?

Man you’re up late or really early! Yeah I thought they were manufactured as part of the caliper too. Bummer———Until——— I saw hemi71x’s post below yours. That master rebuild kit INCLUDES the retainers. Wonder how they’re installed. Gotta be a press fit. Maybe drive em on like a bearing seal?
NO.
There's nothing "press fit" on a KH, 4 piston disc brake caliper.
Everything comes apart easily if the pistons aren't rusted pretty stuck in their bores, and goes back together with lots of manipulating your fingers, with the dust boots, and a small screwdriver.
The first one(s) that you do it's a learning experience, but after that it's easy peasy.