I did restore/rebuild my 71 doors last year. It was a fairly tedious process involving significant metal work (for an amateur like me), but the original ones have both front and back and skin guides made of strong metal, something that you will not find in the repop. Which was next to their idiotic pricing the reason why I took the challenge. Please if you find/buy alternatives, do not throw the old ones away.
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Depressing it was.
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yet, after few weekends, I ended up new doors. Actually even better as I've used high quality zinc coated metal for the skins and bottoms.
@Greg I posted this, as you said " I would pay more to repair ". You will pay more if you let it done that's a certainty because it takes time.
but it is not that difficult. It is mainly tedious. Both my doors costed me in the end exactly 120 euros (about the same in dollars) . 100 for the metal sheet and 20 to let a local company brake the metal on their massive 3 meter hydraulic metal braker because I did not have a way to reproduce the fold on the lower side at the right angle. The bottoms are fairly easy to reproduce on a semi pro braker. Time wise, being an amateur, not having access to special tooling other than my hammer, grinder and welding machine, I took me several weekends, but surprisingly addressing each tasks one at a time, I did not encounter impossible things that would have pushed me to cut corners or throw the towel. Anybody can do it really. A pro with equipment could do the same much faster, but you can count on a several days of work per door. It also of course depends on the repairs required. Mine were in a state beyond patch.