It seems like the wheel holders on the car chassis piece are separate, but attached, pieces. There's a bit of give to them if you pull them away from the body and they have molded studs that nothing can access. Has anybody had any success in separating them? I don't want to just pull and possibly break the piece.
EDIT: Curiosity got the best of me. They are separate pieces, you just need to cut off the cap holding them in place. Don't cut the pole that cap was on though, as it's the only thing keeping the pieces in place when you have them on the chassis. I wonder why they're assembled like that? Surely two more pieces to add to the chassis can't be THAT difficult for the target audience.