TN75D Bolt Sizes for Front Weight Bracket?

[Fguard]

Does anyone know what the bolt sizes are on the front for fixing a weight bracket?

There are spare bolts screwed into the side I was going to use that look like M20 x 70, assume the front ones are similar but the bolts bind when starting, threads may need a cleanup possibly but dont want to force bolts and damage threads.

 

[scarlo101]

My TN75 is M20 x 2.5. I did the same thing to install a 2" receiver for my winch.