I don't think its custom because Dave recommended buying it in this thread?
I want to add an amp and sub to my 2014 wrangler rubicon
He just didn't give the link to it. PM him?
EDIT: this is from another post on this site:
There's a user on here called jeepedjeep who fabricates aluminium brackets which fit perfectly beneath the seats. Here's my set up using the bracket under the passenger seat:
When you get a price can you PM me or post it back here, I'm looking for one as well but will be leaving town tonight for a few days.