I used search and found Optima part # 8003 - 151 in an old thread from '04 but no one has it in stock or in catalogs. Is it discontinued? If so, what Optima type battery fits?
They make a reverse terminal Red. The normal batteries will fit but you need a spacer underneath and you need to mess with the main wiring on the +12v side to gain length in the cables. I chose to use a battery disconnect that moved the +12v closer to the rear of the battery.
You might want to do some searching on the various "best battery" threads that we've had over the past year or two. There are some excellent alternatives to the Optima brand. Several of us have had premature failures on the Optima.