Swapping ZKW xenons for AL xenons is a common solution to the burnt ZKW projector issue. Electronically, they are direct replacements. The only modification needed is to cut a small part off of the ZKW bracket. The AL bracket should fit both units. Here's how I did it. It's very easy.

Here is the difference between the ZKW and AL units:


The AL unit is on the top. The igniter sticks out about a half-inch. It's the box that is sticking out. All you're doing it cutting off part of the bracket to make room for it. I suppose you could not modify the bracket at all and it wouldn't make a huge difference, except for being a bit harder to install.

Here is the unmodified ZKW bracket with the AL headlights:



Before mod:



After:



That's it! I didn't even use a dremel. I just used a pocket knife with a serrated edge.