I have an 8 horse power Horse model. Serial # 751150. I need to replace the Tines/PTO shifting block that rides against the dog gear inside the housing. I have not been able to find it inside the housing. Can I buy one thru tthis site? Can I get a manual showing this item and exactly what goes on the end of the lever? I have the manual that came with the tiller, but can not find this shift lever anywhere in the manual.