My tractor is a YT-3000, model #917.289342. On page 21 of the Operator's Manual, a diagram refers to a "collar" (identified as part L) that slips over the cable housing guide (part P). My tractor did not come with the collar, and I'd like to get one. But in the Repair Parts Manual for this tractor, the collar is not listed(at least I can't find it on the blown-up deck diagram on pg 14). Any suggestions? Thanks in advance.