I'm sure 68-70 glass is the same, but if you'd mind checking your 70s I'd appreciate it. I noticed the curvature continues up the glass in the horizontal plane. At the very top the glass is straight. I also assume it's straight at the very bottom, otherwise it wouldn't have fit in the channel.

I used new nylon(?) glides that fit into the back of the front wing frame. Wonder if they're contributing to the problem. Anyone have experience with them fitting too tight?

Everyone who has responded whose car has original glass confirms the door glass is straight horizontally all the way up the glass. Mine is bowed, as is the one other reproduction-glassed car. I suppose mine could have more than one problem, but step one will be to obtain properly spec'ed glass.