I just purchased a 2002 PreRunner and love it! Unfortunately it's missing one of the center caps on the rims. The rims are steel/alloy and the center caps look like a triangle. I believe the part number is 42603-04070. I am not too concerned about the condition as long as its not broken.
I checked ebay and only found one for 50 bucks. I'm hoping someone may have a spare they may want to sell or know of someplace I can get one cheaper.