Takened out of Farmtrac parts book for the engine bolts. Checked 390 on lot, same size. M 12 x 1.25 x 35 mm. ; 10.9 grade, Qty. 12. The 5140M side loader bolts are takened off the installation instructions. M12 x 1.25 x 55 mm., 10.9 grade, Qty. 8 Installed a great many of them. Hope this helps, Trac