I have the older 73sv 010-01575-01 with downvu/sidevu instead of clearvu. I would like to get a second transducer with downvu/sidevu to mount on the trolling motor but when I look up the GT52 downvu/sidevu, the part number that comes up is 010-12405-00. The problem is that this is also the part number on Garmin's website for the current GT52 clearvu transducer, so how can I be sure to get the older downvu/sidevu style?