thanks, what I deduce my Z had the Kustoms ( per #1 owner and must have gotten changed out for the Hookers that were on it when purchased in 76 up until now)Luckily I still have the original exhaust , manifolds to tail pipes. Very good condition which verifies it was dropped early in the life of the car. I'm on the fence with getting a pair of the reproductions. I know fit and finish is A-1, done my homework. Bottom line for me is if a pair were once on it, I'll splurge.