UltraKnob Insert

It is hard to tell exactly which parts are necessary to upgrade my existing Ultrapoi Orbpoi to have LED handles. I clearly need the Dot XL chips and batteries but I cant tell if the inserts and caps are necessary or optional. I like the shape and size of my current handles and prefer to avoid buying parts I wont need or use. Can I retrofit my Orbpoi handles with just the chip and battery?