Oddly enough I've recently discovered that my nearside one is in two bits - one attached to the bumper, the other to the screw
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I'm thinking of simply making a piece of "L shaped stainless(?) and attaching that to the bumper with pop rivets/small bolts/adhesive and then drilling a small hole in the appropriate place for the screw through the bumper, or a bigger hole with a clip like many of the others around the bumper.
As you say the quality/material of the original isn't great.
If/when I get that far I'll post up some pics.
She's SORN'd at the moment and SWMBO seems to have found "several" jobs that, apparently, need doing
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Andy.