I’m absolutely sure the rear air ride was ditched when it began failing back again within the 70’s. I've a 2004 Buick Rainier that also had the rear automated leveler which somebody experienced eliminated prior to I purchased it. I've witnessed Sport design vehicles having a V6 and 454SS badges. https://454-ss-bucket-seats-for-s67395.digiblogbox.com/44598950/454ss-seats-secrets