Two great spots for information are the Titleist Custom Options booklet and the Shaft Performance Guide...both are available by scrolling down on the 915D2 web page. You can also go to the various shaft manufacturer web sites for additional information.

Not sure of what the question is, but Titleist has multiple offerings for senior/light regular shafts for all the irons and metal woods. Going to the current option list for all the shafts is here - media.titleist.com/.../ Don't limit the possibility based on what is shipped to retail outlets.

I bought a new set of clubs from another manufacture and I ordered the Project X SD 4.5 Light graphite for my swing speed which is slow as I am 69 years old. Shaft weight is 55 grams, Torque High and Kickpoint Low. This shaft has turned back the clock on time and I have regained a half to one club longer. You will need to see if this shaft is available for Titleist clubs.