VenX if you're having problems getting the ARB aligned with the bolt holes, follow this procedure.
Loosen the front and rear bolts you already have installed, so the bar can move freely. Have someone grab the front bar by the top tube and lift it until you can insert the foremost bolts in the bottom slot. Next have the person pull the top tube towards the front of the vehicle. This should pivot the back slot upwards. If it's still not moving you can put a floor jack under the back edge by the bolt hole and use the jack to help lift into place. This should help even up the side wings with the body lines. Not every frame is the same, so sometimes you just can't get the side wings aligned, but pulling forward on the bar, and using a floor jack should get the rear slot in the best position possible to tighten everything down.
This method has helped people get their bars installed without additional drilling of the bolt slots. Hope that helps.