I'm thinking about buying a 91-93 300ZX but I'm curious, what kind of bulbs do the head lights use and are their any HID kits available for them? Thanks!

CATZ makes a system for the 300zx, but it runs about $500 for a true HID system. Here is a link for one place that has it http://www.modacar.com/products/Nissan/300ZX/HIDKITS/, it is at the bottom of the page.

TT300z

HID Place (http://www.Hidplace.com)