Get a piece of 1/4" Starboard. Black will match your TM mount. Cut it to the footprint of your old mount or TM and mount the new motor using that as a base. It will look good and no one will suspect it was an afterthought or is used to cover up anything. Starboard is good stuff and can be used to cover a variety of ills.
2015 Seaark 1872 MV CC Etec-90
Helix 12 CHIRP SI, HB 1199, MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
Bitter Gun Owner