Unfortunately, its not that easy. If you lengthen the wheel base only, the rods have to be longer, or it will make the rear end narrower or change toe. Plus, its hard to say when the radius rod ends would start binding since they are pivoting back further. We can achieve it with our MTS kit, because we are also going wider as well. If you wanted to use the extensions we make, you would have to have longer axles and radius rods, because they also move the wheel out wider. We never tried to just make a wheel base extender kit, so i can't say for sure. You might be able to get away with 1" back or something, without modifying axles or radius rods, but then the trick is the actual plate that moves it back. Plus, the rear toe will change too. The rear end of these are very sensitive to change. If one thing changes, most likely everything will need to change to make it work correctly. It took a lot of time to set up these rear ends the way we did.