for some reason your tensioner unit looks different than mind. Mind has a curve up in the front where it mates to the cam sprocket, I wonder why yours looks different! I'm going to mod mind to make it work with the 4v takegawa head.
Your's should work on a stock grom head
That is what I'm going to do on mind is slow bend the tip down/semi-straight so it clears the cam sprocket in front and reduce the tension to the chain angle coming off the cam sprocket.
Good luck selling your tensioner and parts, hope it sells fast