Just two 7" ones for the headlights
You'll need 5 3/4" ones for the lower driving lights if using the original type driving lights, failing that you may be able to fit some normal spot lights in, or of course just leave them off.
Not sure where you'll find the smaller rings, Demon tweeks used to have them at one point I think.
Edit, these list the 5 3/4" mounting rings
http://www.motoscope.co.uk/lighting.htm