I found mismatched bolts attaching my flex plate to the torque converter on my 65 dart convertible. There were two 5/16” x 24 x 7/16” grade 8 bolts and two 5/16” x 24 x 1/2” grade 5 Dorman bolts. Looking online I can only find “high quality grade 4” bolts. Does anyone have a source for what I am assuming is the correct grade 8 bolt? I looked at Summit, but their bolts or assortments didn’t match my needs exactly. Pictures of the bolts are attached. Thanks