Dang! My memory is going; can't remember what we molded that from. I think the Super Sport was polystyrene, in wich case, standard plastic model cement will work just fine. Otherwise, it might be polypropylene, in which case all you could do is hope to weld the cracks together with a soldering iron, heat controlled by a light dimmer.
To check, just touch an inconspicuous spot with MEK, lacquer thinner, Acetone or other agressive solvent. If it is polystyrene, you will leave a sticky spot, if polypropylene, you will leave a very clean spot.