Hi Martin.
I used the same brackets later on down the line, i bought mine when Aldi had some for sale.
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I saw into the corner so they can be bent to the right angle for fitting & matching up to the fixing hole on the body.
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I still stuck them on with araldite rapid, and filled in with black silicone after.
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As mentioned in the PM i used the fixings from the sound proofing on the bulk head with stainless steel screws, that way if i have to change a bulb in the future it will be easy no corroded bolts spinning etc.
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good luck with the rest of the work
