Fred,
I am using the one with both the side and top posts. The side posts hook to the car and the top posts I cover except when parked, and they make it easy for me to hook the battery tender to as the side posts are toward the inner trunk wall and I can't get to them unless I unstrap the battery. The little plastic caps that came for the top posts are still working great and you can pick them up at any parts store such as NAPA.
I just went and looked and it is a Model 800U with 800 CCA. They have most likely changed the model numbers since I have had this one so long, but I am almost positive that a friend of mine got one of the same last Summer at our local Franklins Auto Parts Store.
Ron
