Im pretty sure you need to create a spacer. I believe they keep the length of the Y the same as the regular X2, and the LMS is a bit bigger. I don't have mine anymore, but I remember having to make a spacer for it. I am not sure but I believe it was either 1/8" or 1/4" thick, and was a very easy part to make. Was one of many flaws I found with my kit that needed adjusting.