The problem with the 453 is the design of the standard stereos. They are a single DIN body with a double
DIN face. That's an incredibly rare layout which seriously limits the aftermarket stereos you can fit.



Initially you were limited to 2 aftermarket options.

Alpine INE-W997D stereo with the surround in either white (KIT-W997SMTW) or black (KIT-W997SMTB)



The problem with this setup was the cost. Generally in excess of £1200.

The next option is some no name Chinese brand thing that's usually on eBay.



It doesn't need a surround as it's designed to be a direct replacement.
This only replaces the Smart Audio System, not the Smart Media System.
It also will not work if you have the JBL extended sound pack.

It's an Android system so it'll probably be a bit clunky.
At the time of writing, these are only £260 on eBay. Search smart wifi 453 android.

Opening Up Your Options

The standard aperture is a single DIN stereo with a double DIN face.
If we could change the surround to just give a single DIN, the options are far greater.

The only limits you have are that it must be single DIN and must push into a cage.
If it doesn't push into a cage, you'll have to get inventive with regards to fixings.

First example for options is this unit. For the stereo and the single DIN surround was about £200.



Secondly, this option including the single DIN kit was about £140.



Single DIN Surround

Luckily, there is a single DIN kit. It is about £70 for the kit though.

Remove your stereo and remove the 2 lower torx screws in the stereo surround.



Then remove the 2 upper Torx screws.



The surround can now be removed...



...leaving a hole in the dash.



This is the single DIN conversion. It's actually 3 pieces.