Hi Nigel - suggest you try a car radio specialist retailer. The box you want should be available. I had exactly the same issue, obtained a 'radio mounting box' - moulded plastic unit tailor-made for radio mounting (surprisingly!!). Radio slots into front opening. Unit has mounting holes for screws, and can be used either way up for either top mounting on a shelf/other surface, or underslung on a shelf/cabinet etc. I did this very successfully suspending on a shelf inside a top locker. I'm sure they are still available. Think you'll have to ask for the product from a car-audio shop though. They're not expensive, but you don't see them 'on display' much either! Good luck. Richard.