J1 / J3 / J5 ● Confirmed

Buick · Regular Production Option

Custom seat/shoulder belt packages

Years 1970 Models 2

Also described as Custom belt packages

Documented applications

Full-Size — LeSabre / Electra / Wildcat →

• 1970 ● Confirmed

  All full-size

Skylark / GS →

• 1970 ● Confirmed

  All intermediates

This page aggregates every documented appearance of J1 / J3 / J5 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.