these taxi customs were built my Mechanic Dan! Dabanka commented and let me know to go over to http://www.clearviewtire.com/MechanicDan.php
where it's written " Between 1977 and 1978, Mechanic Dan and built the Taxi Cabs for the movie The Wiz starring Diana Ross, Michael Jackson, Lena Horne and Richard Pryor. The Taxi Cabs were made out of golf Carts. Dan cut the golf carts in half and made them longer. He then built custom fiberglass bodies and rewired all of the carts. "
Six different photos are on the link above