Amazing factoid: Despite Datsun putting very nice alloy rims on the rally team (real magnesium), it took eight years selling (1970 to '78) For mighty Nissan to equip Z-Cars with a factory 'mag' or rally type wheel, leaving dealers free to fit all kinds of gawdawful slot mags an "Dukes" style rims for an extra profit!  What do you do with  your old Corvair/Falcon 4-lug pattern rims?  Put them on the poor Z-Car.  Some people even though the Appliance alloys were stock!  A problem once at concours judging!
Wick Humble, author of How to Restore Your Datsun Z-Car, in print 27 years, and soon to be republished in a revised edition!