Only fits 4 cylinder in those years
Good used working glow relay. Just removed from a running 1982 240D diesel.
1981-83 240D Glow Plug Relay ( Used )
$78.00
SKU:
USED-240DGRELAY 
Product Details
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$12.00
Late 616 and 617 GLOW RELAY Cover Plate ( Used )
Fits 1981 to 1985 240D 300D 300TD 300CD 300SD
Good used plastic cover for glow relay as shown