Just done a comparison of the various T tracks that I currently have:
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On the left are the old rubber grips that I took off my Graflex. They came from the Custom Saber Shop about 10 years ago if memory serves.
Next to it are the vintage PVC racks that I recently located and put on.
On the right is a PVC sample that I was sent by Tubeway Extrusions in the UK
http://www.tubewayextrusions.com/plastic-misc-profiles.html The dimensions for that are A 4.6mm B 7mm C 10.07mm - basically the same as my vintage track but with a ridge that is much fatter.
Finally, on the far right is a PVC track that looks much more like the vintage track but is taller. All three PVC tracks are the same width (approx 11mm).
The Tubeway T track is only available in bulk with a minimum order for £50.
The modern rubber grips are much wider and possibly(?) more accurate for that fact alone, but I'm so happy to be able to fit vintage grips to my Graflex it doesn't matter that they're slightly too narrow - they still look and feel the business!
Hope the comparison pic is of use.
Cheers,
saberguy.