I just replaced mine but I didn't measure the bolts. I could make a good guess though. They were slottet, round head, 3/8 Diameter.
The two most forward bolts were about 4 inches in length and the aft two were 3 1/2 inches long. I didn't actually measure them so maybe get the longest ones possible and check the length and cut them. Of course use nylon lock nuts and washers.