['ol Pinion head]

The combination of 70-72 GTO front (1 1/8") front sway bar & 1" diam rear bar was not avail until the '72's were introduced.

Y96 Ride & Handling option consisted of stiffer springs, different valves shock absorbers. Am very aquainted with this option. A 70-72 GTO or A-body will set up almost an 1" taller over standard suspension height car when ordered with Y96. Something to think about in a restoration, when about to order new springs

Seems like a huge percentage of '70 & 71 Judge's were optioned with Ride & Handling. On '71 233 series 455 HO cars, similar deal, very high percentage had Y96.
On '71 T-37's, Y96 option also added the next larger size front swaybar. Have to go out & ck, but believe that is the 1" diam front bar, versus a 15/16" diam bar. No rear swaybars on the 71 233's.