James,

This is from the clubs drop down, however my TS2 15 is 1/2 short so that would be 42.5 but it looks more than 1/2" longer than my 18 which was standard. I'll measure tomorrow.

from this you're looking at 1/2" on standard but depends on the person it was fitted for, the 16.5 could be longer or shorter than standard.

Loft Options (RH/LH): 13.5°, 15°, 16.5°, 18°, 21° (RH Only)
Length: 43”, 43”, 42.5”, 42”, 41.5"

Ant