You might want to consider posting your message on the genforum region Israel.
Ben Chetrit (Benshitrit) and Mizrahi are very common in Israel. Many families have moved from Marocco to Israel after the second world war and even before.
If by chance your grand parents worked for the French authorities in Marocco, some records might be found in France (e.g. for retirments purposes, etc...). THere were also many families that moved to France. So you want to try France too maybe.
Benchetrit means 'son of chetrit' while Mizrahi means 'oriental' (from the East, from where the sun rises).
Also if you have more accurate dates, if you can estimate when you grand-parents roughly were born it might help too.