To be clear, BZ only ever sold RTR cars, never spare bodies. In the 1990s, a distributor in Chicago (Trost hobbies) had some clear and painted Batmobile bodies that were leftover merchandise when BZ shut down. Part of that inventory went to REH, part to that distributor. But they were never actually commercialized by BZ.
ALL BZ bodies were manufactured by Lancer, but had mounting holes punched and were painted in house by BZ.
Lancer had its own version of the Batmobile that is different from the BZ model by its blank license plate. The Lancer version is much rarer than the very common BZ Batmobile body.
Philippe de Lespinay
"We are the D..., uh, the Borg. Lower your shields and surrender your ships. We will add your biological and technological distinctiveness to our own. Your culture will adapt to service us. Resistance is futile"