(1) "Insurer" means every person engaged as principal, indemnitor, surety, or contractor in the business of making contracts of insurance, and any person authorized to represent an insurer with respect to a claim.
(2) "Nonoriginal equipment replacement crash part" means a replacement crash part which is not supplied by the manufacturer of the motor vehicle on which the part is used.
(3) "Replacement crash part" means a replacement for any of the nonmechanical sheet metal or plastic parts which generally constitute the exterior of a motor vehicle, including inner and outer panels.