Hi L,

Turns out you'll need to adapt the 9004 plugs and wiring to an H4/DOT 7"
socket.  Easily done. Sockets available at the local flaps.  You'll need
some suitable female...spade lugs.  I presume you have a suitable female
already.

The two pronged leads for the auxilliary lights will work as is.

You WILL need a set of 7" light buckets and they do mount up fairly well to
the existing tabs.

I had to do a little pursuading and realignment.