You are viewing a freshwater used Volvo Penta 1.97 SX-M upper unit. We needed the lower unit which is why it’s separated. Upper is good just need a little touch up paint. Unit has a production number 3868895 and a ratio of 1.97. Just add gear oil and go! There is no corrosion or any signs of salt use. This was strictly used in freshwater! This unit will replace a SX-m and any SX with a 1.97 gear ratio.