Troy Bilt Tiller Rear Bearing Cap part# 1900881010 (#12177, #71804406) is the back cap for the tine assembly. Following are some models that use this cap; 12055, 12056, 12057, 12058, 12059, 12064, 12068, 12069, 12070, 12071, 12074, 12075, and 12080. There may be models that use this cap that we don't have listed, so refer to your owners manual for the correct part number.