There apparently were a few copies of a “factory” T-top canopy but we don’t know exactly when it was offered. Other enthusiasts might have info. to refute the following, but i don’t think I ever saw a photo of a T-top in any promotional material from California Component Cars itself (which made the vast majority of Sterlings out there.)
It seems like, after the main production run from CCC was pretty much over, there were a few variations made by subsequent owners of the molds/rights to the Sterling which resulted in production of a few “GT-style” dashboards and maybe a few T-top canopies which were retrofitted into existing Sterlings. That’s where I think these came from.
The reason I believe a few T-top Sterlings weren’t just one-off customizations Is because they seem to have come from a mold. They don’t seem to be mismatched layers of different weaves of fiberglass, Bondo, etc.
The logically follow-up question is “is there a source for the T-top canopy?” And the answer, sadly, is “no.”
Maybe there is a parallel universe in which Unofun sold me his t~top Sterling AND there was a market to justify making a $10,000 set of molds to re-create its canopy. Until we can interface with that universe, the only path to a new T-top is to customize a regular canopy.