2. This Agreement applies(a) to all authorized insurers, to parties referred to in section 175 of the Act and all parties having voluntarily subscribed to this Agreement. However, it does not apply to insurers of owners of automobiles exempted from section 84 of the Act (see section 196c of the Act) except if such vehicles are insured by a motor vehicle liability policy;
(b) to insurers of a motor vehicle dealer as defined in the Highway Safety Code (chapter C-24.2) with respect to owned vehicles whether or not they are operated on a public highway.