This is what the original trolling mounts look like (or at least similar to). We have a 1999 Horizon 180 F&S with the Evinrude trolling motor.
https://lh3.googleusercontent.com/pZSuWvZ3uhYw_nUVaFsekKnp9b6QbbOadVoZVO133RCJ3tgCTqmMGyN8r3VeDw5C85M_AxxmkI1PgXMBfDu679b8GUncKze-75P3ZzcdwpdBDnIK0MtMogRIyGDimI9w7fl675WQHQ=w2400It might be quite difficult to locate an original trolling motor and these exact mounts. But you should be able to mount up a newer style trolling motor in the same area. Just might have to drill new holes.