Has any one replaced a ballast in a JBJ Formosa 4X65 watt fixture? I just received my replacement ballast from JBJ!

(Thanks for the tip Lise)
They said that there would be an instruction sheet with it to show how to replace it of course there was nothing with it! I was able to get a wiring schematic faxed to me after two days on the telephone.

But it don’t show me which set of lights are on which ballast? I need to be able to trace the wiring to figure out which ballast to replace?
Do the ballast’s just simply pull out after the end plates are removed (is there enough wiring)? Or is there some way that the fixture comes apart?