LudwigP40662 Complete Internal Tone Control System

How is it that a 2 pack has a higher cost than 2 units individually, infact 3 individual unit are the same as a 2 pack..why?

Are there instructions on exactly where to drill hole in the drum?

Are you planning to ship this part in an envelope? I have had parts damaged due to the vendor using a padded envelope instead of a box.

Will this fit any snare drum, does it have to be Ludwig?