notanlines posted two links. The second link has several triple axle fender sets listed with illustrations.
http://www.trekwood.com/parts-search...egory=&page=11
I would suggest calling trekwood and talking to someone about exactly what you want. Remember that items that large must ship freight, so the shipping charges will be significantly more than a simple FedEx or UPS shipment. This is one time when size is a disadvantage......