Saw this thread and thought I would give my 2 cents worth. I have just bought a gt and the drivers side front seatbelt is red. Odly the passenger side and rear belts are black. Did some searching on line and came across this. https://www.ebay.com.au/itm/1X-Fits...t-Belt-Retractable-Red-Universal/153680702232
I am guessing that's what's in mine. They also have black, which I will buy soon to match the other belts in the car.