Paris is a little different for larger guests, with many rides modernised versions of the ones in the US. I am a large guy, the size of a wrestler (6'3, 280 lbs, with wide shoulders and large gut) and I understand the struggles.
Big Thunder Mountain: car is the same width as the one in Florida, with a modification here: the bench seat now has a horn shaped seat divider in the middle. As long as you can fit on one side, you'll be fine as there are no minimal point for the bar to reach to get a clear. It is an hydraulic restraint too, so wherever you pull it, it will lock there.
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Space Mountain:
It is a launched looping coaster in Paris that originally featured cars like Rock n Roller Coaster. The cars were replaced a few years ago and it now features an overhead lap bar with flexible straps that go over your chest and shoulders. The end result is that even when the car shakes, your head doesn't hit anything like on Rock n Roller Coaster. The restraint here is very accommodating and it simply has to get a certain point to lock and show clear.
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Crush Coaster:
It's a challenge, as the cars do not stop in the station and you need to drop into a bucket seat. You then pull down the lap bar and it has no reach a certain point to lock. Here is a photo of Laff Track at Hersheypark, which uses the same cars and lap bars, except that at Disney, the vehicle is shaped like a turtle shell.
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RC Racer:
That's the ride with the tightest restraints at a Disney park. Thankfully,
Disneyland Paris modified a seat to have a longer seatbelt, meaning that I have a chance of fitting on it. The photo shows the non modified test seat at Hong Kong Disneyland and DLP has similar seat belts on the regular seats. As you can see, the space for the thighs is tiny.
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Parachute Drop:
No issues here, as each rider has his or her own bucket seat and only need to buckle a seatbelt.
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WEB Slingers:
Uses the same ride vehicles as the one in California, so very wide bench seats with a lot of leg room.
Flight Force:
Disney repainted some of the cars and ordered a few new cars for the rethemed Rock n Roller Coaster.
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