It's been a while, but I've finally found a new site: Kazakhstan!
http://nomerok.info/m/kazgibdd?carnomer=A740THM&searchButton=+%CD%E0%E9%F2%E8+

Hinted by I-Denev, though I don't know what the starting page would look like, you'll have to start from my link.
You need to enter the number without spaces.