We bought those and they're just about right.
The mounting depth is perfect! However, the mounting radius (the size of the speaker itself) is just slightly to big... But that should not be a problem, just make the hole a bit bigger. Also no grills came with the speaker, so I still have to find those or make them myself somehow if I can't find them. It would be a waist not to have them, because one slip with your foot against the speaker and your tweeters will be gone...