Stock length is 12.5", and anything else is going to affect handling, as will changing tire diameter.
MUCH discussion on this site about suspension choices and effects.
@sonny Many happy tool recommendations from you over the years. For your 1-1/2" thin wrench I'm having trouble finding anything similar now. The Triumph tool is listed as NLA. There is a Ford fan clutch wrench for late 90's vehicles, and that is NLA. The tool you show is still listed in the catalog, and shows "out of stock". Have you any recommendation for what is available now that would be suitable ?