I'm wanting to change my old radiators but am having problems with the sizes. I have 3 that measure 620mm x 1600mm which is fine but I then have one that measures 620mm x 640mm and 2@ 620mm x 960mm. I've looked on loads of websites but can't find these sizes anywhere. Do they exist anymore? If not should I go for the nearest size up or down but will I need to alter the pipes that are already in?
Any help you can offer would be great.