yup, Transport Canada is a thing. I went through the same bureaucratic BS in 2008 when the GT-H was all the rage and I purchased a 2007 GT-H executive 5 spd stick (one of only 17 made 😎). I couldn't bring it home to Canada due to the fact that Transport Canada (RIV) deemed it inadmissible. I bought the car anyway and stored it for a year while I called Transport Canada, RIV and several other government agencies. I was trying to get the car into Canada legally but I had a bunch of back up plans to get the car into Canada.
There are two ways you can go.
1- Get the car deemed "admissible" by Transport Canada and RIV. This is a big challenge and it took me over a year and a half to achieve this. In the end, I was successful but it took allot of work.
2- Take a chance and just import it as a Mustang. The title for the car will simply state that the car is a Mustang. There is nothing on the title that says it's anything other than a Mustang. If you choose to import it into Canada you could bring it across the border and declare it as nothing other than a Mustang. This is risky and more than likely not legal! I know it happens on a regular basis but it is sketchy.
When I brought my car across the border I chose to call and harass Transport Canada, RIV and a several other government agencies. A 2007 GT-H is nothing more than a Mustang rental car, just like a SixT is a Mustang rental car. In the end, I was successful. Would I do it again? Maybe.............., but ya gotta really want the car. If you really want that SixT Rental then Go For It. Life is short. Chase your dreams.