Not sure to be honest, but if your scooter is a lightweight version, there are alternatives to a hoist!
I have a ‘Hercules’ freestanding hoist which is really great for lifting my Pride Quest.
They are available second hand at reasonable prices, and there is no work to be done to the car.
Also, I was reading about a company in Sheffield, Powatechnic, who have a wheelchair hoist, which slips over the rear of a front seat and pulls the scooter up via portable ramps!
No drilling or fitting on either of these options?
May be worth looking at?