To keep it short: It fits fine!
I have installed it a few months ago. I planned on using the ‘57 bracelet with the Apollo 11 50th endlinks but that doesn’t work, the final 57 bracelet link is thicker and that makes it incompatible. So I replaced the ‘57 clasp with the Apollo 11 50th clasp and that worked perfectly (99% due to very minor production differences). No extra parts needed, no difference in dimensions So no money wasted here. I did waste money by buying the complete 57 bracelet instead of just the clasp.
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