I took what they had in stock, I knew it wasn't the nice flat one sold on-line. When I opened it to look I saw they just used two metal tabs to run up the tower on both sides. Not hard to change out but there are also these two batteries inside the tower. The sort of screws up one of my bright ideas. I will figure out how to make it work or just take it back and have them order the correct one for me.Duct tape can work wonders!!!!!!!!