In my experience, most of the mast gates that I have seen from that era were made by the spar maker rather than bought from the spar extruder. I have had an easy time making gates from aluminum angle or barstock, or else bronze bar stock, depending on the design. I usually make mine so that the slugs can pass them and get all the way to the gooseneck but the design will need vary with the actual conditions found.
If you can post a picture someone may have a better suggestion.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay and part-time purveyor of marine supplies