The Buffalos need the rear baggage compartment notched 3or 4 inches to get the maxis to clear. Afaik, 4104 is only GM that they will fit. Be careful if you convert, there are a lot of components back there if it has the dual braking system. I just completely rebuilt all of my braking system, tanks, valves, components, lines, hoses. Did it over the winter. I'll post pictures once I'm sure you don't have to pecker around to get them to fit size wise.
Ok, 4104 and 4106's. Def not buffaloes