Part numbers for 4wp. On hand at most warehouses:
51-5883R2.5 15X8 6-5.5 R2.5BS
51-5183R2.5 15X10 6-5.5" REV 2.5" BS
51-6883R2.25 16X8 6X5.5 R2.25 BS
51-6183R2.5 16X10 6X5.5 2.5BS
Just tell any sales rep to enter the part number for the wheel you need and they can hook you up.