Thinking my seatbelt warning relay has gone bad..... I seem to have all the symptoms. Can't find one for sale other than a dealership so i'm going to run by the junk yard to get one. Will the relay from any 80's MB work or just W126 bodies??

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87 300SDL (work in progress) will be DD
92 Toyota Land Cruiser 4x4 monster (heavily modified)
build thread on mud http://forum.ih8mud.com/80-series-tech/288587-rotf-lt1fire.html

84 K1500 GMC Suburban 6.2 diesel motor...... dying to offer its engine to the Land Cruiser