Why so set on the Fox ones? I have a Fox MSB Euro box but not the side trays which IMO are very heavy and when I have looked in the shops I found them difficult to fit.

The new folding matchbox ones are good if you want a big tray or the preston ones do a job – lots of options in their range, green insert and it will fit your D25.

@David_Herron wrote:

Hi, I bought a Fox Match Universal Side tray for my Rive RX but it didn’t fit because it was the older model without the newer MSB attachments. Also, the 2 arms did not adjust wide enough to fit the 2 legs on the side of my rive.

Will the newer MSB Universal Side Tray fit a RIVE RX D25?

Yes the newer one fits!