So finally got around to fitting the finished article
£8 ish for the nuts (8of)
£20 to have them drilled and tapped (I couldn't be bothered)
Fitting free
Painted tops of screws
9m drill bit for hole
Countersunk
Swapped wheel nuts
Attached caps with hex head screws x2 each wheel.
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So there's the method for those who want a simple way to attach official LR center caps to modular.....
I may add some silicone to the screw threads when I get some just to help them not vibrate loose...