I have a 4066R and I use it with a MX7 mower among other things. The MX7 has a Cat 2 hitch. So I adapted what I had with a bolt and some bushings to use it with the Cat 1 lift arms. I thought I saw a post on GTT that the 4066M HD lift arms had bushings on the implement end of the arm that were drilled for both Cat 1 pins and Cat 2 pins. Just curious if that is true about the 4066 HD lift arms and if they will fit a 4066R. Thanks!