My mil found a Tripp trapp for £20 in their local Sally Army - so we asked them to snap it up! It's in perfect condition but when I checked out the serial number it seems to be a 2001 model. On the website accesories page it says "from 2003" although this may just be in relation to the newborn seat. I really just want a nice cushion to go in it, would the new fit the old or do I have custom make or find an old one?? Anyone know??