You can have grab handles and side airbags----just depends on how the car was designed. The Volt has full length side curtain airbags yet it has rear assist handles. So it can be done. I have owned cars that have a passenger side front assist handle but nothing on the driver side. In one of the cars (don't hold me to it but I think it was a LEAF) under the headliner was the indentation in the sheet metal for an assist handle to mount, but no handle. As it was designed to be a left hand or right hand drive car, the stampings for the internal roof rail were made to accommodate placement on either (or both) sides. In the case of the Volt with no front assist, I think it would be difficult to mount but not impossible. I believe the side curtain airbags deploy between the headliner and the door frame below the mounting point of the rear assist handles. So if added front handles were to be installed, as long as they were placed in a similar manner, they shouldn't be a problem.