You will need lug nuts that fit the rim...some rims use a flat lug and others use a taper...the ones that use a taper can have different taper pitches...find out what kind of lug nut is used on the rim (flat or taper and pitch) then find a lug nut like that with the correct thread count...plenty of online resources to find this information...
I tried Mustang wheels on mine. They use regular cone lug nuts. Since the wheels I had used a center cover I just got plain lug nuts rather than chromed acorn nuts, less than $1.00US each at common auto parts stores.