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 Add To Cart Added! Dierks Bottom Mount Anchor Pulley Block for Bo's type system welded or bolted to bottom of transom.BM4B