Imperial diameter steel is quite easy to get hold of in the UK, specific types or grades can be trickier but stockists are usually pretty helpful.
A word of caution.
Last summer I saw a carrier that had been completely re pinned. The old track had been heated (quite hot judging by the steel colour) to free it off then all the old pins removed and newly made replacement pins fitted. It looked great and was an impressive job. The problem was, after some miles instead of the track wearing as it's designed to it began to cut and grate itself. The fine swarf was found all over the track, wheels and suspension. It sounded much harsher than the steady hum you get from original track.
I think the material properties of the track were changed whilst it was heated and this caused the track links to become much harder and not behave as they ordinarily would.
I'm sure re pinning can work but care must be taken.
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