I respectfully disagree... While the rear Mud Guards recommend removing the rear tires and drilling a hole on the outside edge, I found it far better and sturdier to drill a hole on the inside bottom edge behind the tire. It is a little snug with the drill, but you can drill the holes just fine without removing the tires. This way the Mud Guards are attached at the top middle and inside bottom edge, rather than top, middle, and outside bottom edge. They fit perfectly and secure, and do not move.
Ok, I jumped in and installed my mudguards today. They look sharp. I do see where having an inside screw on the rear flaps would be nice. I may add one.
Got 'em from Toyota Depot, but BEWARE: Though price is listed at $31.13, the cheapest shipping is $24! And the full box weighs less than 3 lb. So you'll do just as well paying $43 to Metro. Easy install, easy drill thru plastic only, fit well. Could be a little bigger.