VSSB is a type of DRAC. Original reprogramming docs didn't even say "VSSB". All my data shows the "white box" versions are plug compatible but if you have something different I've got an open mind. Earlier trucks had DRAC built into the back of the dash and was programmed with a special fuses instead of resistors. Reprogramming meant popping all the fuses then installing a specal programming key which was nothing more than a series of jumpers. I've seen some vehicles where dash programming clip is set for "divide by" ratio of 1 and white box DRAC is installed.