Soft A-bar fitting kit

Evening all. I’m new to the forum, so this may have been covered before. Sorry in advance if it has.
I have been around Defenders for ever but have only recently bought my first one, a 2012 110 XS Utility, and I’m loving it. I’m finding lots of little bits to accessorise andhave found a decent second hand non-winch soft a-bar, but it didn’t come with a fitting kit. I ordered kit LR005236, but having gone to fit it today, realised that the bracket that fits to the bumper doesn’t have the threaded hole in the centre to fix the a-bar to. Would anyone on here happen to know the part number of the kit that I need?
Thanks in advance

Do you have some pictures of the a bar/ fitting kit? Or the parts manual diagram? May help identifying what you are after. All a-bar/bull bars I have fitted have used the same bolts and mounting holes as the bumper itself.

From your description though would some rivnuts do the job or drill and tap the bracket/bumper itself?