I need help about size and offsets.

[72nismo]

I have a 72 Datsun 510. 4 lug.I would like to put some 17" or maybe 18" Racing Hart Type C.I know they fit but i dont know what offset i have to get and what would the biggest lip be that I can get.I would like to put 8.5 on Rear & 8 on front.Does anybody know what would the offsets have to be so I dont have to use spacers? Somebody told me i could use +22 front & +28 rear.Hear is the pic of the wheel and my car.Thanks [http://i129.photobucket.com/albums/p235 ... 5102-1.jpg][http://i129.photobucket.com/albums/p235 ... TTYPEC.jpg]