It dosen't say what size but here's the kit. Fastener Kit Rear Valance 4 Incl Hx Pp - #C-7833-106AK - National Parts Depot I think they were 5/16-18 on each end with the clips. There were 2 that hold the license frame bracket on also but I think they were a smaller size. Front or Rear License Plate Bracket Fastener Kit, 4-pc bolt kit - #C-12945-101K - National Parts Depot