Get the size and buy them a NAPA. Mine broke and I replaced them w/NAPAs and torqued to 90 ft lb. I have an Arctic Fox TT and it weighs 9K.Bolts are torqued to stretch them so you have to know the hardness or class of a bolt before you torque it to anything. Also there are torque tables for bolts and torque wrenches are supposed to be calibrated. How do you know you are putting 110 ft lb to the bolt?
I hauled new TTs and the Mfg always said the front of the trailer should be lower than the rear by 2 inches on bumper pulls.