WORKS FOR THE FOLLOWING MODELS Z50'S K3 THRU 1987 CT70'S K1 THRU 1982 ATC70'S K0 THRU 1984 CT90'S K4 THRU 1979 CT110'S ALL YEARS ATC90 K1 THRU 1979 ATC110'S 1979 THRU 1984 204z @ *CAM_CHAIN TENSIONER and CT90_LEFT COVER_PLATE SCREW'S O-RING 5.5MM_X_1.5MM 91301-216-000 7/20A (205F)FITS ON CAM CHAIN TENSIONER LOCK SCREW WORKS FOR THE FOLLOWING MODELS Z50'S K3 THRU 1987 CT70'S K1 THRU 1982 ATC70'S K0 THRU 1984 CT90'S K4 THRU 1979 CT110'S ALL YEARS ATC90 K1 THRU 1979 ATC110'S 1979 THRU 1984 ________________________________________________ WORKS FOR THE LEFT SIDE COVER PLATE SCREWS ON ALL CT90'S 205F @ *NUT, HEX. 8mm oem honda 94001-08000-0S 1/22A (R2262) THIS IS AN OEM HEX. NUT 8mm. takes 12mm wrench R2262