ISO new 15x7 slotted mags
 

I am a forum noob that, after much online searching with no luck, is hoping that the deep and broad experiences available here may have some advice if not answers. I am recent owner of a new (to me) 260Z (1/74 build date) with stock 4x114.3mm wheel hubs. I am on a quest to find a set (4) of 15x7 slotted mag wheels that look like the attached photo. (16x7 *may* also work.) These were common for these cars at the time, though then typically with a 14-in. diameter. Motorsports in Orange, CA, has a listing for them but no information about IF much less WHEN they may become available.
http://www.thezstore.com/product/470...kit-70-85-z-zx
Any and all suggestions are welcome. Many thanks in advance!