Hello, Homedepotcustomer - We're sorry to hear that this side discharge chute did not fit your lawnmower and was returned! This chute is compatible with the RY40180 and RY40190 models. And we wish we could have been able to connect, so we could have tried to turn this experience around for you. But we thank you for leaving this review. And feel free to email us anytime at Reviews@RYOBItools.com, if you'd like to continue this conversation.