You just have to clip off the bottom 2 clips from the base
You're talking the same two tabs you cut off any standard auto parts H4 55/60 bulb, right?
(A lot of the other LEDs guys have used required more mod to the hole or retaining ring to fit a bulb fan.)
Correct, clipping off those two tabs was all I had to do, other than that they went into the sockets normally (Well, normally as that ever goes, especially when you've got giant plumber's hands like I do) and the existing wire harness plugs right on, nothing more to it.
I've been running these same bulbs on m other Interstate for around a year now, and no problems to report, very glad I made the change (Although I'm sure some drivers in front of me probably aren't, I try to aim the lows a little lower than normal for that reason, but just a hair.)