These should help to improve the XM headlights.

http://www.ebay.co.uk/itm/3-HID-BI-Xenon-H...=item2575a39bbf

They also do them in 2.5" RHD which is a better fit.

I have just ordered a set and will report how they look/work in my XM when I get them.

Watch this space.....

So you fit these in place of the existing dipped bulbs?

Basically Yes, you also don't need the inner lenses any more.

I don't know how to put pictures on this forum or I would show you how to do it.