what battery for 2005 varedero

[Sandeater]

Hi dogs, need new battery,  book sais 18ah but batt in bike is a toplite ytx 14 bs 12ah, thats 6 ah less than what should be in. Was at WOA but the only 18 ah they got is to big to fit in batt box, and + and - on wrong side.

 

[Badtothebone]

 

[Tonteldoos]