Yes, you are right. I have just read that link about Oldsmobile 98 Ambulance in Mother, Jugs & Speed and there, in comments, Buc84 and Animatronixx say is a Oldsmobile, built by "Cotner-Bevington", adding Animatronixx, is a 1970 Oldsmobile Cotner/ Bevington Cotington 48" Ambulance.

http://www.imcdb.org/vehicle_109553-Oldsmobile-98-Ambulance-1970.html