Brey Krause R-9259 Sub Belt Mount - R-925X (Narrow & Medium) & R-9052 Seat BracketsThe Brey Krause Model R 9259 Anti Sub Strap Mount is designed to mount directly to Brey Krause's line of R 925X BMW E36 & E46 Seat Adapter Brackets and the R 9052 Porsche Side Mount Bracket. The stainless steel bar is threaded on both ends to allow for length adjustment between various seat sizes, while still keeping the sub strap guide centered. Bar can be used with Driver or Passenger side mounts, and can be mounted in two possible positions on the