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Could someone give me the measurments for the holes for fitting a BBS rear spoiler please, Colin.

make a template using card?

does it have little studs you need to drill holes for thru the boot lid?
get some masking tape and stick strips vaugly where the studs need to be on the boot lid.
get the spoiler and put it in place.
the studs will make little marks in the masking tape.
drill where the marks are.
should be just about in the right place.