Just a quick FYI for those of you considering the Optima upgrade... The batteries you get from Pep Boys or Autozone will have the plastic spacer which helps the battery fit better. They don't like to order anything from Optima and don't believe there is an orange top or 34R anyway. So you order from http://www.1st-optima-batteries.com/ but they still want over $15 for the spacer. Not quite a bolt-in replacement but not a big deal either. The net result is that Optima is NOT supplying the spacer with all batteries! Cheers!