The new master cyl. for 4 wheel disc brakes is exactly the same thickness as the old one, THE ADAPTER DID MOVE IT OUT 1/2'', SO IT MADE MY ORIGINAL ROD A 1/2' SHORT, iT`S BEEN ON THE CAR FOR 8 SOME ODD YRS, I WOULDN`T CALL IT NOT THE RIGHT ONE -----Dam caps button is always in the way !! OR ,