Bankshee

Im new to the banshee world, at the moment im in Cyprus and my friend back home went to pick up my new 2004 banshee 350 so I have only seen it by pictures and videos. I’m after some advice, it’s a road legal banshee and I just purchased some goldspeed carbon wheels 10x5, 8x8. I’m not sure when it comes to the sizing but would 21X7-10 and 21X10-8 be fine to use ? Or would I need to use larger on the front and smaller on rear or vice versa I tried asking tyre shops on the phone or by email but they just tell me to go their website with zero help.