Need Audio Help Alpine PWE-S8 Pwr Sub

Maybe everyone can help me. I purchased a Alpine PWE-S8 powered Subwoofer off or craigslist for a great deal. Only problem is that it didn’t come with the mounting feet. Does anyone have any I could buy from them?
Also I have a Double Cab w the storage compartment under the rear seats. I was originally planning on mounting the sub under the drivers seat but that’s not going to work. That leaves me with two options:
1-mount in storage box or remove the box (really like the box for storage) still would need something to hold it in place.
2- Behind the rear seat. Don’t know how to remove or fold down,take off the back part of rear seat.
If anyone has one of these can you post pictures of the way you mounted it or even other powered subs and there locations? Any help would be so welcomed and appreciated.
Here’s the sub:

 

You are good. Your local stereo shop should have everything you need. Even Best Buy should have the mounts in their install Dept.

 

Well you would think they would but so far no luck. A guy on eBay is checking to see if he has a few. Of course Alpine doesn’t sell them. It wasn’t a big deal when it was just going to sit under the front seat but I mount it in the storage box it will move and rattle. Same behind on the wall.