Dierks Anchor Parts › Dierks Bottom Mount Anchor Pulley Block BM4B Image 1 of 1 Dierks Bottom Mount Anchor Pulley Block BM4B $32.95 Dierks Bottom Mount Anchor Pulley Block for Bo's type system welded or bolted to bottom of transom.BM4B Quantity: Add To Cart Added! Dierks Bottom Mount Anchor Pulley Block for Bo's type system welded or bolted to bottom of transom.BM4B