Those belts are fine, my shoulders are plenty wider than the seats. If I were Fuzzyfish’s size I’d worry.
Besides I bought them to keep me in the car when going around corners, not for when I’m in a head on collision. I’m not jumping on the “you need holes in the seats for harnesses” bandwagon. The way those tie together in front of me and behind me will keep me in the seat just fine.
X…