Many thanks for the description of the different front glasses in the headlights.
I have decided get the HID kit from Ebay (same as lance328), just waiting now for it come come to Kuala Lumpur.
All the three bikes use the H4 bulbs so it will be a good test to try out and see how well it works, on the VN750. I like the idea of the separate halogen bulb as the HI beam so it the xenon blows you still have a light source to get home with. With a blown xenon then a usual H4 can be fitted until a replacement is bought. The same Ebay supplied wanted US$30 for a spare Xenon bulb, too much at the moment to have stored on the shelf.
I am going to test with the existing wiring and if it seems ok, put a couple of relays in the lighting circuit, HI and LO relays and run a new power wire straight from the battery, then the higher turn on surge will not go through old wiring and switch contacts. Then I can fuse near the battery and protect the cable to the headlights against any shorts to the frame, larger cable as well, less voltdrop, lower current surge.
Now a question on the headlamp unit, if the existing headlamp glass and reflector do not work well with the Xenon bulb, where can Iget a replacement from and any ideas on approxmate cost ?