CE Smith Backing Plates for 70 Series Flush Mount Rod Holders-Replacement Parts and Accessories for Tournament Fishing, Rod Fishing, Deep Sea Fishing and Trolling Use this backing plate for all 70 series rod holders (53670A, 53670CA, 53671A, 53671CA, 53672A, 53672CA) 316L cast stainless steel 4" x 5-1/4" Four millimetres thick Use your 1/4" stainless bolts and nuts (hardware not included)