I want to get an optima yellow top battery in the near future. I need to know which I should get, like what model number, since they all seem the same to me. It will just be used for normal things, nothing extravagent. I got rid of my old battery and plan to relocate this one to the trunk, but I'm going to make my own box for it and I need to know what the dimensions of it are first. So any help would be appreciated. Car is a 90 240sx with sr.