I am looking to put a 136" track extension on my 2002 440x and wanted to see who else has done this. The 2002 440x came with a SC3 skid and I'm trying to clarify the correct rail extensions to buy from Tracksusa.com. The 2000-2002 rail extensions on TracksUSA are for trail sleds, which did not have the SC3 skid yet. Would I purchase the 2003 rev rail extensions for the 2003 rev SC3 skid? Even the folks at TracksUSA are a bit unsure without precise measurements so I am looking for some DooTalk feedback from prior experience or knowledge.