96 Tracker, rivets galore. Where do I need to mount the transducer for My Helix 9 Mega? As a side note, I own a metal fab buisness and we work with aluminum every day. I could put a plate of 1/8" over the rivets under the boat. I COULD cut out the rivets and weld the ribs in place, BUT I'd have to pull the gas tank and the only way to do that would be to remove the rear deck and that's not a job I want to tackle at this time.