Xd wheels help me

I just saw your long bed in another thread, I thought those rims looked familiar...

 

http://www.google.com/imgres?imgurl=http://www.allfordmustangs.com/forums/attachments/5-0l-tech/90469d1266034934-wheel-size-questions-1992-mustang-gt-wheel-offset-backspace.gif&imgrefurl=http://www.allfordmustangs.com/forums/5-0l-tech/219058-wheel-size-questions-1992-mustang-gt.html&usg=__sgqGxeMvIDIzmx6NENn1ztWNMng=&h=272&w=272&sz=13&hl=en&start=3&zoom=1&um=1&itbs=1&tbnid=ewixKD3WOozMeM:&tbnh=113&tbnw=113&prev=/images%3Fq%3Dback%2Bspacing%2Band%2Boffset%26um%3D1%26hl%3Den%26sa%3DN%26rlz%3D1R2GGLL_enUS380%26tbs%3Disch:1


and this is the easiest way to explain backspacing and offset in my opinion

 

yeah just got them put on about a week ago

 

so when theres a offset of -12, do you need a wheel spacer? or does it just mean your wheel will stick out a bit.

 

Ok guys i need help i have a 2007 tacoma long bed but im trying to put some rims on it but idk what size to put on, either 22's 0r 20's XD rims and my truck is not lifted.