I am replacing a Furuno 1621 radar with a Raymarine RD418D ray-dome on my 1995 Catalina 36. The Furuno is attached to the mast bracket with a square mounting plate that is about 8.5" x 8.5". The RD418D mounting screws are about 9.17" apart, so the plate is too small. I have attached some pictures of the plate. There are no markings on it, so I am wondering if someone knows who the manufacturer is so I can contact them about getting a larger one. Thanks for your help.