You mean this thread? https://www.duramaxdiesels.com/forum/threads/lly-p1093-shim-mod-instructions.267/Not a busted link but the pics don’t work for me in the FPRV thread in the DIY section anymore.
LLY P1093 Shim Mod Instructions: is the title.
It looks like a copy of what McRat posted on DP and the pictures are still there. https://www.dieselplace.com/threads/p1093-shim-mod-instructions.37711/