I have a 115 Optimax Serial # 1B803509 Model # 1115D83HY. I want to replace it with a bigger motor and I found a good deal on a Mercury 150 XR6, don't have the serial number but he says it's a 2001 model. It's in good shape but the only issue is both of the transom brackets are cracked. Will the ones from my 115 Optimax work on the XR6? They look the same to me.