Okay, so after readfing the thread, I still don't know what battery to get!

I want a Yellow top Optima! Which model will fit the H3 Tray? I don't have an issue with removing the box cover or the vent tube, but I am really not intersted in modifying the interior of the engine compartment to fit a battery.

Has anyone bought a yellow or red top specific and mounted it in an H3? What didn't have to be done? What did?
Most important is what model optima battery?