electric sharpener oregon wheel size

Hello guys, im a new guy. I purchased a electric sharpener Ozaki XLP950, it seems to be a clone of oregon 511a. It' came with 2 wheels, 3mm and 4.5mm. I have husqvarna 353 and i'm using Oregon 21BPX chain. Non of these wheels are the correct size. So i would like to purchase a decent wheel...