Going through the shop product pages, I ended up ordering 2 x Proton Gun cables due to how the required products are linked up. Refer to https://www.gbfans.com/shop/power-cell- ... light-kit/. It links to the Proton Gun cable vs the Power Cell cable.
I sent an email to webmaster once I realized my order error a few days ago but no response yet. I'm not concerned about the lower price difference for the Power Cell cable - more concerned about getting the right parts in one shot before my order ships out.