The jack out of your '68 Lemans is the California style jack. From my researching this topic, cars from the California plants - Freemont and Van Nuys, at least - had this style of jack. I would guess that your '68 is a 'Z' code Freemont car. They obviously had a different supplier than other plants. The '69 jack you have definitely looks to be correct for cars built at other plants.
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1968 Firebird 400HO convertible
1971 Trans Am 4-speed, white/blue
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