Confused

I ordered a 48v 1000W hub motor off of E-bay from Xym corp in china, It says this wheel motor is available in 24,26,28 inch wheels and also a choice of front or rear motor. I ordered the item off of E-bay and the order went through, but not once did E-bay ask what size wheel I want or front or rear. I want a rear wheel 26 inch. How do I know what I'm gonna get now?