(a) A reflector shall be mounted:
(1) at a height from 24 to 60 inches; or
(2) as high as practicable on the permanent structure of the vehicle if the highest part of the permanent structure is less than 24 inches.
(b) A rear reflector may be:
(1) included as a part of a taillamp if the reflector meets each other requirement of this subchapter; and
(2) mounted on each side of the bolster or load, if the vehicle is a pole trailer.

(c) A clearance lamp shall be mounted, if practicable, on the permanent structure of the vehicle to indicate the extreme height and width of the vehicle, except that:
(1) a clearance lamp on a truck-tractor shall be mounted to indicate the extreme width of the cab; and
(2) a front clearance lamp may be mounted at a height that indicates, as near as practicable, the extreme width of the trailer if mounting of the lamp as otherwise provided by this section would not indicate the extreme width of the trailer.
(d) A clearance lamp and side marker lamp may be mounted in combination if each lamp complies with the visibility requirements of § 547.355.