Ercol Confusion!

So, this is the 3 piece Ercol suite that Sandy at Thremilestone is refurbishing. However I have to get the replacement cushions sorted. The guy (Bryan at Stage One Upholstery) who is going to do this needs to be certain of the sofa details and have some measurements to double check. I feel that the opportunities for this to go wrong are well in excess of 100%. We are pretty sure its a 252 which is a 203 but with Fleur de Lys.