It might be possible to glean the info from the Factory Assembly Manual, which has part numbers for the nuts and bolts shown. I've looked at a few, but unfortunately, the bolt PN's aren't the same as shown on the
Master Parts List - Standard Parts pages. But the nuts cross over, so thread size and pitch are available. But it would be a big task.
Maybe someone who has bought a hardware set from one of the vendors could volunteer to share the bolt info (head type, size, thread pitch, and length) with us. [HINT, HINT]
