Direct Connection RB connecting rods

Do u not mean 3/8s bolts as in all the factory RB rods. 5/8s is 4 sizes bigger. As in 3/8s, 7/16s, 1/2, 9/16s then 5/8s. I doubt there would be room to have a 5/8s bolt and nut as u would probably need to notch the block also Kim