I know there was a thread here somewhere about the optima battery but i just wanted to update everyone who might be interested in buying one. The people at 4wheel parts have in their computer system that the battery that is reverse poll (red on right and black on left) is discontinued. But it isnt! I had them call optima and find out for sure and they do have them. The part number is OPT 8040-218. That is for the yellow top. I dont know if it is a different part number for the red and blue.