1999-2000 Miata HID kit - $60
I have an H4/9003 HID kit that will direct-fit into your 99-00 Miata, or any other vehicle that uses H4/9003 size hi/lo beams. This kit is plug-n-play, no cutting/splicing required, and includes brackets to mount the ballasts. Brand new, w/ box, etc. Kit includes 6000K HID low beams (super white, slight blue tinge, like an S2000), and halogen hi-beams on same bulb, so it works with your OEM set-up.
Test-installed them on my Yaris, but can't keep them because the projectors I ordered are a 2-bulb setup. They work perfect and look VERY sharp. My dumbness=your gain.
$60, and I'll even deliver/help install it at the next Miata GTG. :drive: