No, if you're retrofitting, you only need a single xenon bulb. Projectors have a cutoff shield which moves to allow more light to shine for a high beam. the high beam kicks on from the wiring harness.
Op, how did you fit the mini gatlings? When I tried to fit mine, they didn't even come close to fitting. I had to cut them down and in the end they just ended up breaking because I cut too much off. Gonna use trimmed down e46 shrouds when it warms up and I get around to doing this.
has anyone found where I can get actual GM replacement lights? Since they will be much higher quality than aftermarket and easier to work with.
Edit: Ok I found genuine replacements on PFYC, but holy sh!t! They're $124 per side.