Tim, you'll have a hard time to find the correct drive snout to fit the blower. You'll be better off sending the existing drive snout out for polishing. Don't ever remove the bolts holding the front case cover on either. Any questions about the blower let me know as this was mine at one time. Those marks are from the hoses I had for the catch can system that it had. The gun drilled pulley vent bolt option I had PSE do never worked right, and I purchased the correct Kenne Bell baffled catch can for it.