Hello, I am replacing the bushings on the front A arm on my 2010 sportsman 500 touring. I ordered new OEM bushings. When I removed the old parts I can see the stock metal spaced (the hollow bar the bushings press on to) seem to have grooves cut into them. At first I thought they were worn, but it looks like they are machined this way?

Other than the grooves they appear to be serviceable. Can anyone confirm they come from Polaris with machined grooves and not a smooth outer surface? Thanks.