Thanks guys. Regarding the No.22 decals, it's from a pretty new online store that I found online. I think the guy prints his own decals and sell them. As for the accuracy... the graphics are good but it was just one big gigantic piece of decal, meaning you will have to cut the decals on your own. Also, you will have to use some of the No.23 cars decals that comes from the Tamiya kit.
Here is the link to the store:
http://www.scalemodellink.com/
Regarding No.23, yes it is the old mask-and-spray method. I build one with the OE Tamiya stickers ages ago and it did not age well at all.. I scraped it and will be making a road version soon.