I looked at the Johnson site.
They show three versions of hyd flat lifters for Mopar...... reduced travel, short travel, fast bleed.
$400-450 msrp

I was told Eaton was back in the flat tappet business again.
I just looked it up....... technically they are, but it’s not like they started making them again.

They bought the Mexican company Morestana in 2005.

I see some places selling a few parts from Stanadyne, but I think it’s just leftover stock.

So, for stock replacement type BB Mopar lifters made in the USA, it’s probably down to just HyLift Johnson.