I have a Marin alpine trail with three different shock mount points. Does anyone know for sure which is which. I know for sure the middle is 5 inches but I don't know the other two. One is 6 and the other is 4 but I have no idea which ones they are. A picture is below. Thanks for the help. I got a fox float rl for this bike now and in the bottom I have way to much sag even with high pressure.