Rear glass- Original versus reproduction differences

[cboss70]

A once large mustangs parts seller here in CT (MU) is selling off what's left of its inventory with big discounts. I am always finding and working on mustang projects and saw that they had clear rear fastback glass for 67/68's and was thinking of getting a couple.  Some projects I don't care about originality so basic functional repops work.   I know repro glass, even if they are marked with original style factory markings, are usually thinner. What I can't seem to remember is about the visual "seam" down the middle that stretches from the center of the deck lid up to the roof.  Is that seam/ peak or whatever it's called present on all factory 67's and 68's?  The repro glass doesn't have it.

[JD]

My understanding was the factory glass does have the etched line.  (also as you indicate in your post the factory glass was tinted on all cars A/C or not A/C)

[Bob Gaines]

My understanding was the factory glass does have the etched line.  (also as you indicate in your post the factory glass was tinted on all cars A/C or not A/C)

some of the repro glass has the etched line and some doesn't . The no line is in some cases preferable given they can be off center sometimes from the mfg . It is easy to put the etched line in and line it up with a given cars body line assuring a perfect match. +1 all the back glass should be tinted. Believe me concours or not you would not want it clear.