Condition: Used Part Brand: Holt Best Caterpillar Warranty: No Manufacturer Part Number: 70 120 D6 D7 D8 D9 RD6 RD7 RD8 This listing is for a very complete and restorable engine from a relatively early Holt 75 crawler tractor. The last photo of this listing shows a nicely restored Holt 75 crawler tractor. That photo is for reference only. That tractor is NOT part of this listing. The skid that ...