It would be great to see standardisation on aluminium extrusions but I think the asians use offcuts from much larger projects to fabricate woodworking components like fences and is why we have difficulty in finding a supplier.
But this is what Rut;ands call 19mm t track: It's very confusing!19mm is the standard size for jig making. As said above Woodworkers workshop are not much more than the cheap ones on eBay. All T tracks look the same but the cheap ones are made of an aluminium alloy , what you want is the solid aluminium as sold on Peter Sefton's site.
https://www.rutlands.com/products/t-track-19mm-pack-of-2But this is what Rut;ands call 19mm t track: It's very confusing! View attachment 185357
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