bar Nut for 1122 664 0503 1122 664 0508 Stud 21Pcs Chainsaw Replacement Parts Kit for Stihl MS660 MS460 MS440 066 046 044 with Chain Tensioner About this item Compatible with For Stihl MS660 MS460 MS440 066 064 046 044 Chainsaw. Simply mount the felling hooks on the right side of the chainsaw guide bar with the screws provided. OEM Part Number For 1122 664 0503 1122 664 0508 1127 007 1003. Adhere to strict OEM standard, the bumper tip is a perfect match to the original. 21 in 1 Parts Kit Package includes 2 × Spike Bumpers & Matching Screws 2 × Studs & 2 × Nuts 1 x Chain Tensioner Parts Kit. Heavy Duty Construction Our spike bumper is made of heavy duty stainless steel to withstand tough cutting conditions. The sharp claw can dig into logs to provide a pivot point that gives you more leverage and better control while cutting.