67 model stabilizer bar hardware

Found my 72 Duster 340 front bar with OEM hardware. 5/16 x 7/8 grade 5 bolt with integral washer, nut on bottom with no washer. Personally if I was starting from scratch, I'd run grade 8 bolts 5/16 x 1.00 with grade 8 washers under the head and grade 8 nut with blue loctite.