Thanks for all the help, The new carpet for the seat backs, which i got from KHM, has a MBtex flap on the bottom. I guess this bends around the bottom of the card to make a nice finish to the bottom. Is the 3mm card would be too thin to staple on the back, should I just glue this on the underside? BTW, I got the old cards out and they were both broken so I have made new ones.