New member here and I need a picture or two to help me get this right.

I am fitting the heater ducts to the bulkhead of my 1964 series 2a. It has the bulkhead with the return lip for the windscreen seal. I have the correct "T-shaped" ducts which have the studs on that point downwards and how do they bolt through the bulkhead? (ie, not the type with "tabs" that come out sideways and screw to the windscreen).

If someone would be so good as to photograph theirs so I can see how its drilled / mounted before I start to make holes / remove metal and get it wrong. (I have no holes in the bulkhead at present).

Thanks in advance.