Okay, I see what they're doing. They don't wanna limit your travel by including bump stops with the kit, since you may run tires up to 37" and may or may not have flat fenders, etc. Seems odd to me, though, since most kits I'm aware of include them.
What you're gonna have to do is, when you decide on a tire/wheel combo, talk to someone at RK and figure out what size bump stops will work best for your setup. I'd stick with bottoms front and rear (there are tops, too) if you can.
Based simply on the Bilstein 5100's and your choice of a 35" tire I'm gonna say you want around 2" of bump stop front and rear.
I'm not sure if RK sells their own (I THINK they sell stackable aluminum ones), or whether you'll have to get them somewhere else, like TeraFlex, for example.