Vehicles, such as all terrain vehicles, can be provided with a frame and a fender assembly. Specifically disclosed are compounds having the formula:where X is sulfur or selenium; where the R and R1 groups are alkyl or alkyl that together form a ring of carbon atoms; where An is the anion of a strong acid; and where the Z element is a chiral ring-completing system of atoms that changes chirality on tautomerization. The legs each have a clip portion for engaging and capturing the rods or welded fabric such that the cage spacers are oriented this their apex in a plane parallel to the plane of the face of the rods and the face of a mold.