ahhhhh...k, well, you know, Chi is the "da man" when it comes to all things jdm. Haha. So basically you have two options:
1) Learn how to read japanese and place an order online, and buy this:
http://www.wisecart.ne.jp/snapon/7.1/SIMGKW/
2) Learn how to make your own - getto version. Which is probably better, since...uh...at least I use a REAL snap-on keychain.
a) Buy a "stubby screwdriver" from Ebay. Make sure it's branded SNAP ON. But hurry! if you check ebay, you will see that most bidders are ricers like me. You don't understand how much competition I had bidding with guys like "acu-boy1" and "HondaPwns".
b) Put the screwdriver in a VISE, then using a mallet, tap the rubber part off. This is what you will use - discard the actual screwdriver.
c) Take your existing car key, put that in the VISE, and using a saw tool (I used a small circular saw...kinda looks like a dremel..but with a bigger wheel) and cut off everything about the key, except for the part that actually goes in the ignition slot.
d) Heat the remaining key up, then jam that sucker into the opening left on the SnapOn Screwdriver. Alt, you can place the key on a VISE, then place the rubber part on top of where the key end would go in - then tap from above with a mallet. Make sense?
e) Go to home depot - buy one of those rings that look like a question mark. Drill a small hole into the other end of the snapon rubber, then screw that ring in.
voila.