A shame that sites on the internet are so ephemeral.
Wikipedia is nowhere near as comprehensive unfortunately. FNDC contained season data such as car numbers, sponsors etc. A great resource, sad to hear it sounds like it's gone.
You can try often retrieve old sites using the
Wayback Machine at archive.org.
For example, an archived version of FNDC from July 2010:
http://web.archive.org/web/201007210....jp/fndce.html
I hope it's complete.
At the Wayback Machine you just have to paste the original site URL into the box, in this case...
http://fndc.hp.infoseek.co.jp/fndce.html ... then click "Take Me Back".