I have four Kohler "alterna" shower faucets(approx 30 years old)
I saw Richard T. upgrade this exact faucet on episode#512 during season 5.
I have had zero luck finding any resource for the same upgrade kits used on the TV show.
My plumbing supply place is telling me that Moen has a trim kit... however it has a completely different footprint and style.
I would have guessed Kohler would have something, but no.
Any advise and input would be appreciated.