Ballast wiring question

[Bartman]

Howdy,

I'm going to try to upgrade my fixture from an NO FL ballast (pic 1) to a VHO FL ballast (pic 2). The wiring on the negative side of the bulb is a little different. Any thoughts on how I'll deal with 4 wires vs. 2? I'm trying to use the same wiring but I don't have the whole thing apart yet.

Also, there is no wires attached to ground on the old ballast and the new one has a green ground wire. Do I attach this to the green ground wire on the power cord (which is grounded to the case)?