Honestly I have no idea what it's called. It was purchased when I was 1. 1973 asphalt roller, drum front, smooth rear tires. 2 water tanks, a fuel tank as part of the drum fork for oiling the tires. 4 cylinder 2 stroke Detroit. The drum has been re-skinned twice. I never had a chance for a picture, but it is the coupling between the vibrator, and the drive assembly. Love Joy's coupler is different, but it looks like our in house Macguiver is going to fabricate something to fit the love joy. Our stock man is the type of guy who loses sleep over stuff like that, so I thought I might put it out there.