Viper Steering Wheel, Black

I recently purchased the Viper steering wheel because I love the design looks feel. After opening the box it looks even better than the picture. However when I went to install it on my 1990 Mastercraft I found the wheel hub was not splined to match my helm. It's merely a tapered hole with four key ways where you would need to insert keys to wedge while tightening down?? No sure. At $29 it's hardly worth the hassle of returning etc, etc, etc but I wish there were more photos or a fitment guide for what Brand, make model(s) of boat it does work on. If any??