Replacement Springs For 69 charger?

Where is a good source for oem like rear springs (69 charger)?

Dont mind paying more for a long lasting spring but some tell me many are the same overall quality?

Thanks!

I just put a set of Espo's XHD + 1" rear springs on a '68 Road Runner, that had someone else's repro 4.5-leaf springs on it that were dead.
When I say "dead" I mean they had over 1.5" of curvature in the wrong direction.
Car now has perfect stance.