Hey Clint,
If you use the tc upper deck, or the 2.5mm "solid" upper deck it has the little wings on the side for the posts. The chassis that have the holes for the posts are the chassis that comes in the tc kit, the 3.6mm solid chassis for foam tire carpet racing, and I believe the 5 cell chassis does as well. Pretty much anything with the plastic battery trays works with the posts.
I use them on my foam tire carpet setup, but I've honestly very rarely even thought about using them on asphalt or rubber tire racing in general. I have stiffened up the front and it seems to make it a little more responsive off center, but overall I get a little bit of a push from running the posts on the front of the car.
-Korey