I use the Red Top Optima battery as you can see in the picture below:

(Click image to enlarge)


A yellow top would only be needed in the event you are running a winch, lots of driving lights a huge stereo system or all of the above.

The blue top is used mostly for marine/water craft. The design is such that you can leave the blue top stored for a year or more (seasonal), get in and start it right up were most other batteries would need to be charged.

If I'm not mistaken all optima batteries can be mounted right side up or side ways if you are concerned about space.

Looks like you probably just need the red top but I'll let you be the judge of that.

Do some research here for starters:

http://www.optimabatteries.com/publi...nfig/home.html

Best of luck