So does anybody on the forum know the size & length of the thermostat housing bolts or where I can get them for my 98 GT? Sadly when I had my 98 GT checked out by a mechanic in my town for an overheating problem due to the radiator cap which none of us caught until after we picked up the car. The mechanic must've torqued down one of my T stat bolts hard since afterward I was able to get one out but not the other since it got rounded. I just recently got ones that were meant to work on my car...

1998 Mustang GT thermostat housing bolt sizes