I have not noticed until now, but apparently the link on the main page is not working correctly due to the password code we used to have on the old site...
You can get to setups for the following mods with these links:
CUP
http://nascarheatracingleague.com/setups/setups1.html
NBS
http://nascarheatracingleague.com/setups/setups3.html
CTS
http://nascarheatracingleague.com/setups/setups2.html
The new site will have a more updated setups section, stay tuned.