1996 evinrude intruder 115

Hi everyone, my 16 yr old saved up his money and bought a nice 1991 Nitro 170 TF with 1996 Evinrude Intruder 115 for bass fishing. It came with no lower unit but have since found one. The boat is in pretty decent shape and just needs some TLC and very minor repairs. Does anyone know where we...