Ryan, I tried to fit the dust boot around the base of the bulb and it was such a super tight fit that it was starting to push the bulb around and I was afraid that it might screw up the lights alignment and I would start blinding airplanes. I didn't want to cut anything (I never do on that car), but it seemed to be the best way to make everything fit. The dust boot still fits snuggly against the bulb, so I don't think that I'm going to have any dust or water issues.

If you don't HAVE to cut the boot I wouldn't. It just worked better for me to do a little trimming. I always try to keep everything original, so I'll probably try and find some unmolested dust boots to keep around in case I ever go back to standard bulbs.