One quick Question on flashing

Hi all - This is going to be my first time flashing anything but Netgear's firmware, and I think I'm up to speed on how to do it properly (I hope). I'm going with Kong's DD-WRT. The only thing I cannot seem to find an answer to is where do I find .bin file when it's time for an update?

I see on Kong's page he has the initial .chk file for the R7000, and there are .bin files for other models, and some .bin files that do have model numbers in the name. Any help would be appreciated.

Thanks...and wish me luck!