Reese Towpower 58504 Fifth Wheel Rail Mounting Hardware Kit Installation Hardware; For PN[30035]/PN[30153]/PN[58058]; Incl. 10 Carriage Bolt 1/2 in.-13 x 2 in. GR8; 10 Hex Nut 1/2 in.-13 GR5; 10 Block 5/16 in. x 1 in. x 2 in.;