This is a sunstar 37 tooth rear sprocket. Looks just like the OEM ORIGINAL. Also included is a new front spk and CORRECT LENGTH 420 chain with a connector link. Chain_&_Sprockets Z50A AND Z50R LOOK_CLOSE 50c/sSET$25.99PICK_YOUR_MODEL_AND_YEAR: Z50A&R_68_TO_81_SET_12T/37T/76L=9A/9A/76Z50R_82_TO_87__SET_13T/37T/76L=17A/9A/76Z50R_88_TO_99_SET_14T/37T/"78L"=16I/94C/78 Z50 REAR SPROCKET ONLY 1968_TO_1987 9A$14.99 Z50R 1988_TO_99 REAR SPROCKET ONLY 37_tooth_428THIS IS ALL LEVEL AND SMOOTH ON OTHER SIDE 94c$16.99 *SPROCKET RETAINER PLATE FRONT Z50'S 1968 TO 1981 (9G)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. 9G$1.49 *LOCK PLATE FR SPK Z50R'S_82_TO_87 ATC70_82_-_85 TRX70_ALL (79K)FOR USE WITH THE 12 TOOTH CT70 SPROCKET !!!! 79K$1.50 *LOCK PLATE FR. SPK. CT70_69_-_94 ATC70_74_-_81 Z50R_88_-_99 (24K) temp out of stockTHIS PLATE KEEPS YOUR "STOCK" FRONT SPROCKET FROM FALLING OFF OF THE CT70K0 THRU 94 ,, ATC70'S 74 THRU 1981,, Z50R'S 1988 TO 1999 AND THE XR70'S THRU 1999. 24K$1.49 *BOLT FRONT SPROCKET LOCK PLATE FITS Z50'S (81_AND_OLDER) (9F)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. 9F$2.50 *BOLT_FRONT SPROCKET LOCKING_PLATE FITS ALL BUT(6x8 MM) (Z50 81 AND OLDER) (53D) temp out of stockTHIS BOLT WORKS WITH OUR #24K AND #79K LOCKING PLATES. SOLD EACH, OEM HONDA BOLTS YOU NEED TWO PER BIKE. WILL ALSO FIT ATC AND TRX 70'S BOLT (53D)$0.69