A facebook member shared this the other day.
ARP Head studs from VPW (ebay Store) = $293.15 incl. shipping
ARP Cylinder Head Stud, Pro-Series, 12-point Head, For Nissan/ Datsun, L24, L26, L28 series, 6-Cyl, Kit
SKU: ARP-202-4206
(there's an eBay discount code you can apply to reduce the price from $318)
https://www.ebay.com.au/itm/325650427232