Drill 2 sizes W or 23/64 clearance holes through the upper & lower motor mount brackets. After putting in a new insulator You should start the with a #30 or 1/8 drill through the bottom plate & use your final drill size to transfer location then disassemble & drill the top plate with #30 or 1/8 then to full size.
Then put the bolts through with washer bolts are grade 8 with hardened washers. I put some rubber under them so they would not rattle.
Hardware list 2pcs 3/8-16 4 or 4 & 1/2 hex head bolts 2 self locking nuts & 4 washer do not tighten them as they only should contact when the rubber lets the motor raise up. Look at the pictures.
Then put the bolts through with washer bolts are grade 8 with hardened washers. I put some rubber under them so they would not rattle.
Hardware list 2pcs 3/8-16 4 or 4 & 1/2 hex head bolts 2 self locking nuts & 4 washer do not tighten them as they only should contact when the rubber lets the motor raise up. Look at the pictures.