Kumar,
I am very interested in your Plaubel Graflok back. I am trying to figure out if it will fit my Plaubel Junior 4x5. Some photos I have found on the web show what I believe is the exactly the same back as yours on a Plaubel Junior but I am just not sure. I have tried to paste a photo below. Also do you know if your (#4) 4x5 Graflok Back PS6/433 fits the (#3) Standard PS10/H-144 you also have for sale?