47-55.1 Rear speaker mounting

[8man]

How are you mounting rear speakers to these trucks.

The 48 had some custom panels welded in place when I got it. They followed the curve of the side and back of the cab. Only problem with them was I had to make a spacers to set the speakers out from the metal piece because the speaker was hitting the side of the truck and wouldn't bolt in. I can't find them anyplace.

I've seen the ones from LS Fabrication, but don't know how they install and/or if there are other problems with them.

Thanks.