Torx T50. 89,9xx on my 2013 FFH and this happened today. I was able to pull the cushion to unbolt the bracket, however the belt retracted completely into the seat and will not release at all. The belt is fully retracted with the buckle pulled to the reel and will not release. Going to the dealer this week for the 90k oil change and will inquire about a fix, but I already know how this song and dance goes. Considering this is a safety issue, it wouldn't be a bad idea for those with this issue to file a complaint with NHTSA. I have done so and it takes roughly five minutes. These complaints are what NHTSA uses to open recall investigations. The complaint can be submitted online here: https://www-odi.nhtsa.dot.gov/VehicleComplaint/