Side Pin Tooth (SHORT) Part Number 9W8551 Family J550 Standard Pin Part No. 6Y8558 Standard Retainer Part No. 8E5559 Heavy Duty Pin Part No. 1073378 Heavy Duty Retainer Part No. 1078559 Pocket Size 55=5.5in Machine: CATERPILLAR 988G, 992, 235, 245, 345, 350, 375 IF YOU CAN'T FIND WHAT YOU ARE LOOKING FOR, PLEASE CONTACT US. PRICE AND PART NUMBERS ARE USED FOR REFERENCE PURPOSES ONLY.