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I think that you will find that the numbers are 3845736 and 3845737. These are the left and right rear exhaust pipe/muffler assemblies applicable to 1964-67 Corvettes with N-11 off-road exhaust.
The SERVICE muffler/pipe assemblies were the same as originals for the off-road system. There may have been some differences with respect to stamped numbers. However, I would expect that this difference, if it existed at all, was one that happened over time. In other words, if one had purchased a SERVICE system in, say, 1965, it would have been identical to the PRODUCTION pieces.
As far as I know, no 1963 models were actually built with optional the N-11 system. However, the system you have can be installed on a 1963. One caveat, though: some modification of the pipes may be necessary to clear the "tool kit" wells (in the floorbaord behind the seats).
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