wheel mod import tuner

hey im new here but today I did it. well almost, ive made the little wheels on the import tuner to fit the bit char-g, well sort of i was only messing around a bit but i know i can do it. all i need to know is the size of the hole on the stock wheels , i sort of just used pressure to stick the front axles in but now they dont turn i need to make the hole. man these wheels are great they have those brake disks so far so good just need the size of the hole can anyone help me out.