I've seen them with 2 or 3 different names on them but think they were just rebranded from RAD.
there have also been 2-3 different styles from completely rounded center section to the multi shaped like you have
This came on a 2000 I just bought with a Graydon pipe and silencer. The piston is locked up in the motor. I paid $150 for the whole machine. Looks like I got a deal!