capicitors for a prtr cbl CF 2800 compressor

[tooltrek]

some time ago i removed the 2 capicitors from my porter cable CF 2800 air compressor
and they are long gone, i found the replacement kit here for like $ 79.00 but i would like to find a least expensive place to get them, it has a AO smith motor s# k56a43b23
it is wired for 110 or 220 , but i run on 110, why is there 2 caps ( i takes 2 wires the other 3 wires) does the 3 wire capicitor for 220 operation ? do i need it ? i tried checking the ao smith site with not much luck, any help would be appreciated.