I'm not currently home to take a picture of how I mounted the current speakers on there, but I was able to find a picture of the bar itself when I had finished building it.
The red circles are where the front left, center, and front right speakers are. Those are RCA speakers that came with a cheapo home theater system from Walmart. One of the subs are from that same cheapo system the other sub is a Sony SS-WSB123 woofer I received from a friend.
I know this wouldn't be the perfect set up but it's only for the garage.
Also if it helps, I currently have 10 total speakers (subs included) hooked up. 2 fronts, 2 centers, 4 rear, and 2 subs.
Wish I could take better photos for you.
Here is the link to the picture.
Bar