I'm not 100% certain (as I got shot of my mk4 over 4 years ago years ago!) but I'm pretty sure there should be a plate that sits in between the two modules and keeps them correctly spaced. It's very hard to tell from just looking at the photos, but I'd say the missing plate would be a larger contributing factor to wonky headunit/in dash changer that that bracket.
Unless you've removed that plate it looks like someone's had an aftermarket unit in there before you and not replaced it (funnily enough, exactly what I did...)
You can replace your factory stuff with single (your stealer will be able to supply you with an oem pocket that will fill the hole) or double din if you don't want to keep it, neither will need the fixing bracket in you photos.
I'd also say, if you;re going to go double din, save your pennies and get yourself a screen based headunit.
They look mustard in a mk4