If it uses an H4 bulb there are several kits you can get to convert them. I've done it on three cars and am very happy with the results. I get a nice, bright beam with a good cutoff pattern and I haven't been flashed once since I did it. The car I had the most struggle with was a two-stage conversion, first from sealed-beam headlights to the Hella replacements that use the H4, then to bixenon bulbs. I had trouble getting them aligned until I found an old alignment tool. Once I did that, it was a piece of cake.

This place offers good kits:
www.brightheadlights-hid.com