Try looking for car chassis/bulkhead bungs, rather than an electrical , the sort of things that block drain holes and cable entries for left hand drive versions etc. Old Minis for example are littered with various bungs and they will all cover thicker panels than 1.6mm.

This will do the job for you I reckon...

http://www.minisport.com/14a7091



Now... Where to find a Wallace

(Sorry couldn't resist! )

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