Tony,
It appears that you may need to confirm the digits in the serial number.
According page 9-1 of this source, serial number 91072658 should belong to a T-110-L-5 (D60-L):
https://armyvehiclemarking.com/wp-co...compressed.pdf
The 15 May 1945 Retroactive Parts List for D60-L also shows that your stated serial number belongs to a D60-L rather than a D15.
Please have look at the other D15 thread that Alex linked for more images of the D15 serial number list.
Perhaps the 7 in your serial number is actually a 1. If so, it would be correct for a D15.
As for the date, the 15 Jan 1943 D15 Parts list covered up to serial number 91052625.
Colin
