The MC-5C featured a modernized front end to match the 40-foot MC-8 which was in simultaneous production.

In 1979, over 200 special MC-5C buses were built by Greyhound under contract from Aramco in Saudi Arabia. Two versions were built, one with 44 intercity-style seats and one with 41 transit seats and two passenger doors. Modifications made for desert operation included an increase in air conditioning capacity, an oversized engine cooling system, dual air cleaners and an extra roof cover to insulate coach interiors from the action of the sun. These buses have since been returned to the U.S.

Information from the Bus World Encyclopedia of Buses – 1988