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You may want to check out Centerline wheels (www.centerlinewheels.com). They provide several styles to fit a Z with "direct-bolt-up" applications (no spacers or adapters needed). Depanding on the style you select they are available in 15" to 17" diameters and 7" to 8" widths. However thay do note that 8" widths may have clearance problems unles the Z had a front air dam and rear fender flares. When you go to the web page, scroll to the bottom of the vehicle list and the last item is Z-Car (datsun)

You may want to look at Centerline wheels (www.centerlinewheels.com). There are several models available for zed as "direct-bolt-up" applications. They are available (depending on the style you select) from 15" to 17" and 7" or 8" widths, but they do say that 8" may not fit unless you have an air dam application in front and fender flares on the rear. They recommend "Zero" offset but can provide a custom offset as you wish.