RBK2050 KIT
https://www.ropeflex.com/shop/c29-3217-rbk2050-kit-31
https://www.ropeflex.com/web/image/product.template/31/image_1920?unique=a1e54eb
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RX2050 PLATE & FASTENER ATTACHEMNT KIT (BLACK)
This kit includes plates with 4.05 inch center to center hole spacing for 3/8-16" size bolt.