['ol Pinion head]

70 & 71 Pontiac A-body used the HF code 14x6 wheel on GTO's & V8 A-body's. Im not sure how much longer this code was used, but I am watching when in old yards.

'70 Pontiac A-body's did NOT use the same coded wheels as the new 2nd Gen F-body's.
'70 Formulas w 14" Rally II option received 14x7 JS's. '70 Pontiac A-body's were not built with 14x7's. Instead, the GP's, which used the same disc spindle & rotor as A-body's, when equip with Rally II wheel, received the '70 usage JM coded rallyII's. The JM rally II was first introduced early Summer of '69 Firebirds & was used til the end of '69 Bird production.

In the '71 model year, the KS coded 14x7 rally II was introduced for GrandPrix & Formula usage, this code lasted for at least 3 more model years.

During the Fall of 70 UAW strike, Pontiac Engineering consolidated several things. One was the prev 70.5-early 71 A-body only 14x6 rally II usage wheel (code JT) was replaced by the KU. The KU was also shared as optional on the Ventura II (X-body). In '72, the KU wheel continued on as the optional 14x6 wheel on V8 Venturas, but the KT coded 14x6 went on A-body's.

Last, if you collect info on '71 Pontiac A-body's, like I have one w the GT-37 Survey, one will notice the wheel box on '71 Pontiac plant build sheets shows JT as the 14x6 rally II wheel code for many months after Motorwheel began producing the KU 14x6 wheel, & those KU wheels began being installed at all A-body assembly plants.