Hello Gil,
Yes, a very common problem. 'They promise' it will be the correct one but you receive a general part.
Don't worry. This is generally possible to place a later pre-sewn softtop canvas onto an earlier frame with the upper wooden bow. On my '64 the same was performed. My canvas was from GAHH, ordered for the VIN as well, and I received the "one-fits-it all" solution.
Your upholsterer should check the proper fit of the ST canvas first.
Finally, the chrome strip with its nails can be applied through the newer ST canvas into the wooden bow; only a very well-trained eye would see the difference.
But check for the proper fit of the canvas first. Mine was a bit tight at the rear ends.
Good luck
Achim