OK So looking to replace some bolts that hold on the top plate on a fuel safe cell. They screw into rivnuts and are allen bolts. customer want so change a few things on his top plate and replace the bolts with stainless steel BUT he's unable to remove a bolt and i will have to order new ones online and don't want to wait days for them to arrive. so looking for thread size and i'll guess length since I know how rivnuts are. are they a M6, M8, M10 1/4" 5/16" or smaller 10 or 12 size bolt and thread please. So if you have one and want to pull a bolt and check it that would be awesome.