Size of holes for front speakers (non-JBL)?

I decided to start upgrading my speakers, and bought a pair of Infinity 6002I 2-ways for the back and a pair of Infinity 6000CS components for the front. Got some great deals on these from one of those returns/refurbished item dealers on ebay (about $75 all together).

Anyhow, I went to use Sparky's guide for the back doors, which worked great _except_ the fact that my speakers didn't come with the plastic mounting bracket pictured in his guide. All I had was the speakers and a metal ring that was slightly too small to cover the hole from the original speaker. I ended up making my own bracket out of pieces of wood... it seems to work but is pretty ghetto. Anyhow, I'm wondering if I should expect the same problems when I do the fronts? Are the holes the same size as in the rear, or are they smaller?

thanks!

 

I asked a couple local installers, and none of them sell mounting brackets on their own. In fact, they just custom build their own stuff as necessary. I think the wood bracket is OK, but it just feels kind of sketchy using plywood in my brand new car :roll: