I finally got all the rust holes welded and got the rear cross member installed. I am not sure where this tow hitch is from, but this tow hitch came with the car. The tow hitch was held by only two bolts in the middle holes with nuts welded on the cross member. I am trying to use this to bring hole diggers. Should get all the holes drilled to install this? Would two holes in the middle be enough? This is about half an inch thick steel. Should I use washers or bolts to close the gap between the cross member and the tow hitch? I lost bolts for these. What is the bolt size with pitch?