I think you guys have covered every thing - for 'fused' diode read 'defective' incase the OP is looking for a diode with a fuse. Hope no body's toes hurt but you guys have enough trouble with 'earth', 'bonnet' and 'boot' when I post.
Good - Fast - Cheap: Pick any two.
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i