Picture provided by Phil Mino.

Top cowl is 23(late)-25
Bottom cowl is 15-22.

Phil,

Thanks so much for posting the photos of the 23-25 and 1915-22 style cowls next to each other. It will make it a lot easier for anyone to learn the difference just by looking at that one photo. I'm sure those two parts weren't just sitting next to each other -- thanks for taking time to drag them out, take the photo, and share it as well as the earlier one you shared of the firewalls.

Hap 1915 Model T Touring cut off and made into a pickup truck and 1907 Model S Runabout