What off set wheels are they ?, what size are they ?, the 3 door hub is different in many ways, most noticeably cost, you won't get any change out of £150 a pair s/h, then you also may have to buy new tca's, as the outer joints are different and won't fit some std hubs.
I can only assume you are using a larger wheel diametre, and it is hitting the spring pan ?, the spring pan on the cossie is much higher, ie further away from the tyre, on a cossie with std wheels/tyres, you can't squeeze your little finger in the gap between the tyre and spring pan, there is a gap but very small.
tabetha