What model car is this all for?
Do you want Datsun 1000 wheels [3-1/2"] with welded on hubcap clips, or 1200 wheels [4"] with pressed-in nubs for the hubcaps.

The 13 wheels from the 1600 [510], 180B [610] & the Stanza [A10] seem to be pretty much the same, so you might have more success with the later ones. Just make sure that if you use the 13" ones, that they are all from the same model as there may be some variation in rim width & offset.