my kitchen has a cooker switch like this:

http://tinypic.com/view.php?pic=2e55uu1&s=4

i want to replace it as its grubby (old paint, stains etc) but cant
find a replacement the same size. it measures 11.5 x 17cm. the new
ones seem to be smaller!

any ideas if i can still get one the same size as i have ?