I am finishing some renovations on my new to me catalina 22. I am going to put the mast back on the boat to bring it to the marina. I want to connect the shrouds before raising the mast. How do I know which shroud goes to which chain-plate while the mast is laying on the boat? The main thing I am confused on is how to tell the difference between the forward and aft lower shroud? I cannot distinguish between the two of them in order to attached the correct one to the correct chain plate.