I measured my driver's side quarter and I get a consistent 5/8" all the way from the front to the back. That's with taking a tape measure and measuring to where the outside of the quarter starts to make the bend. If you want to keep that quarter, then I'd slice it right down the middle from front to rear and make it a consistent measurement, matching your factory quarter width.
As for the door jamb, what build date is your car? I know that my quarters are NOS 67 coupe quarters, but they are later build quarters. It's my understanding that the 67's had the full telephone receiver in the early run, but that switched to what the reproduction has later in the build year. My NOS quarters have the same jamb stamping as your reproduction. My original quarters looked just like your original quarters, so I wouldn't stress much on the difference in the stampings there.
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