He just got some bad information. Do a search of Orion 3600 on this thread and you'll see you're not the first person to ask that question. In fact, I dont think that I have ever heard of a car where those lipos with simulated humps on it fit well in a car? When they first came out people with standard tc chassis with the six slots bought those, they just about all had to shim the heck out of something or do some other mod to get them to fit.
If you're thinking of getting one also, like I said before the Trakpower 4900 is probably your best bet right now. Orions coming out with a Platinum TWO pretty soon thats 5000mAh thats probably worth waiting for.