The Stovebolt Site Forums The Shop Area General Truck Talk 1955.2 GMC engine compartment support rods

I'm having some work done to my 55.2 GMC, and the guy doing the work was wondering about the curved support rods in the engine compartment. They run from the frame near the lower radiator support to the top of the firewall, one on each side of the engine .I know they have a name but I can't remember what they are called. He also wondered if they are needed. Seems like years ago I read that they were only on the 55.2 and not later years. My questions are, what were they called and are the needed? Thanks.