ARP front wheel studs. Fits 300ZX, but requires 1.5 x 12mm lug nuts. Same ones sold on [ www.splparts.com ] for $100.
$50 SHIPPED
Dency Wheel Locks. The best wheel locks you can get. There is a keyed lug nut, but then also a cap that goes over it that can only be removed with a special magnet. These fit any 1.25 x 12mm vehicle such as the 300ZX. New they are around $130, plus waiting from Japan. These are brand new in box.
$100 SHIPPED
Silicone PS J-hose for an NA Res and PS Pump. I replace mine with all 6AN fittings. This is brand new part. Regularly $23 plus shipping