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Along with the others, I think you have the valet key - I've found that most key shops, hardware stores, etc. only carry or use the valet blank instead of the master blanks.
The difference is in the thickness of the rib which runs the length of the key on either side - the valet key has a thicker rib (i.e., sticks out farther from the key centerline), and won't go into the narrower keyway designed for the trunk & glovebox. The notches on both edges of the keys are identical between the valet & master keys - the only difference is in the overall thickness of the key; this way the master will go in everywhere, while the valet key will only go into the locks with the wider keyway.
Three solutions come to mind:
1 - get a master key made at the dealer
2 - find a key shop who has the master blanks
3 - get out a dremel tool & CAREFULLY grind down the ribs on the side of a spare key until it'll fit the trunk lock - make sure all filings are cleaned off before trying the key... (Remember, you'r not grinding on the notched edges, but the ribs on the side of the key!)
This is based upon my findings on my '86 740 - I think it should also be applicable to the 240, though. Also, this assumes that the trunk lock has not been changed somewhere in the past...
--
Tom Harper ('86 740GLE; NØMKC; Denver, Colorado)
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