Recently I bought a large ( E28 ) trunk lid toolbox on eBay. BTW, the foam bulb holder has slots for old ceramic style fuses.

The provided spark plug socket (right) is way too fat for M42 spark plugs. The factory 318ic M42 spark plug socket (left) is too long for the new tray:

I am guessing the sizes 16 and 21 stamped on the sockets refer to the socket size.

Does anyone know what is the proper part number for a spark plug socket to fit properly in this toolbox? Or is this the wrong tray?

The provided spark plug socket (right) is way too fat for M42 spark plugs. The factory 318ic M42 spark plug socket (left) is too long for the new tray:

I am guessing the sizes 16 and 21 stamped on the sockets refer to the socket size.

Does anyone know what is the proper part number for a spark plug socket to fit properly in this toolbox? Or is this the wrong tray?
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