yes, we added an additional pair and kept the originals. the originals are fine. It was just a problem when we carried our bikes on the rear-the lights were partially blocked. we now have 4 brake lights. the new pair is approximately 30" above the bottom of the pod. this puts the electrical connections at the very highest point inside the kitchen base cabinets. we simply spliced the new wires to the existing brake light wiring-same colors on the new replacement lights as the originals(red, black and white). The hardest part was getting the nerve to cut a 1 1/2" hole in the pod.
This mod was done on our "new to us" 179. we did the same thing in our previous 173. You can see the mod in our page below.
Vann