I tried this on another thread, but I think it was old so trying a new one. I am replacing the frame on my 1969 GS400 Stage 1 convertible. The replacement frame has numbers that do not mean anything to me, so please help. The numbers are faint in some areas so a couple of the numbers are a guess. 396 and then either (6 or 0), 7, s (with a circle around it), 291 Can you numbers gurus help me with this?