i'm just about finished converting my 73' cz 477 175 from 6 volts to 12. now i need a battery. i was speaking with my auto electrician and he doesn't have anything small enough. same with battery world. the dimensions are; 130 x 130 x 50 mm. speaking with the auto electrician, he said to fit the biggest battery i could fit in there. shame its a small space. does anyone know of a battery i can fit here? the bike is kick start only, i think this makes a difference? thank you.