Hi! I think you are referring to all those extra parts that you can add to the jetpack. If you see the bottom part of the jetpack it has a metal grill and 2 switches. On the other 2 pictures you have the beacon and the stabilizer.
hey guys! what are the greebles on the ROTJ SE fett pack?
The left is either a 5 pin female chassis connector or a 3 pin. I can't remember which- I want to say it's a 5 pin. I've seen s few different pieces used on the right side. It seems to be either a grease zirk or small push button switch. Maybe someone can clarify or direct to a previous thread?