THIS 12 TOOTH IS ONLY FOR THE 1981 AND OLDER Z50A'S AND R'S.. THIS TAKES OUR LOCK PLATE 9G AND SPECIAL BOLTS 9F Y3005 @ *SPROCKET RETAINER PLATE FRONT Z50'S 1968_TO_1981 23802-045-670 7/20M (R2007)THIS LITTLE PLATE HOLDS ON THE FRONT SPROCKET TO THE OUTPUT/COUNTERSHAFT. IT TAKES TWO SPECIAL SHOLDERED BOLTS SOLD SEPERATLY. THIS PLATE IS ONLY FOR THE 9A 12 TOOTH Z50 FRONT SPROCKET. R2007 @ *BOLT FRONT SPROCKET LOCK PLATE FITS Z50'S (81_AND_OLDER) ATC185/200 AND MANY OTHER HONDA'S (SOLD_EACH) 90084-041-000 1/21M (R2006)THIS ROUND SHOLDERED BOLT IS SPECIALY MADE TO HOLD ON THE FRONT 12 TOOTH SPROCKET WITHOUT THE CHAIN HITTING ON IT. THESE ARE ONLY NEEDED ON OUR 9A Z50 12 TOOTH FRONT SPROCKET WITH OUR 9G LOCKING PLATE. R2006