I have a Minkota Terrova 80 mounted on the front of my boat. I ordered the Extreme Max 3006 bracket to mount a Helix 5 transducer to the motor , but it was too small to fit around the 4 inch diameter 80 Terrova. Does anyone know if the Minnkota MRK-15 transducer mounting bracket fit the Terrova that I have ? Does anyone know if it is made of steel or plastic ? If anyone else has any other ideas or products on how they mounted their transducers to their Minnkotas , I am all ears.