my 74 450sel had an armrest in the trunk when i bought it. the armrest has a post on it and there is a corresponding bracket with a hole in it on the passenger seat. it appears to be a press in fit without any fasteners. anyone have experience with this?

Typically the MB armrests secure to the driver's seat with 2 hex head bolts. A plastic cover snaps in place to hide the bolt heads.

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Fred Hoelzle

my 74 280 has its armrest on the passenger seat same as the 450sel

Regardless, the armrest should fasten to the passenger's seat with 2 hex head bolts. Check your 1974 280 and see how the armrest is fastened.

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Fred Hoelzle