Introduced in 1983 as the Marathon XL, this was the first 102-inch-wide Prevost. Passenger windows are higher and wider than on the Champion which it replaced. The name was simplified later to Prevost XL.
Beginning in late 1987, the headlights were channged to halogen and the headlight bezel and lower front grill were changed. The tail lights were changed to columns of rectangular lenses.
Information from the Bus World Encyclopedia of Buses - 1988