Please could any of you experts help me, I have an Omega Constellation, Stainless Steel, basically a square case. I need the case seals and also the four screws which hold the back on. Would anyone know what the thread size is on the screws? In the back of the case the numbers are 168.0063 and 3680858. If anyone could sell me these parts or point me in the right direction I would be extremely grateful. Many thanks, Chris.