ok. Two bolts pairs.
Top pair are chrome, 6mm hex key drive needed ( same as most others). Length is 20 mm. Diameter is 9.4mm, 16 threads in the length. Thread is the same as others on the bike.
Bottom pair are standard hex head ( not allen key) bolts. All other dimensions are the same as above.
If I hit home Depot or Lowes, I'll measure them the right way.
Measurements take with my brand new $1.97 plastic caliper so standard warning apply ( i.e. new tool, unfamiliar use, cheap plastic tool)