Well that's one less worry, no radio yet! The p.o. took his out when I bought it. And for Jimmy Joe,not that it matters but the locks on an SD work off of a pump in the trunk not residual vacuum, but thanks for the other tips

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So far...'76 240 D (sold)
'84 300SD (sold)
'85 300D (sold)
'83 300SD (p.o.s. waiting on tranny swap)
'82 300SD (could be the keeper)