Fused spur replacement

[ipbr21054]

Evening.
I need to changed a fused spur at my sisters. Ive supplied a photo of the existing item & also a new item at screw fix.

Am I able to just replace the front piece or must I also change the back box etc.
Screw fix one requires a 32mm back box ?
I mean will this be a standard size etc then the back boxes get bigger from there on ?

Many thanks.

 

[sparkwright]

The item you have shown from Screwfix is all you need.

A straight swap.

Those things fit on a 25mm box, so why they have mentioned 32mm I don't know, but it will be fine.

 

[ipbr21054]

Thanks very much.