If you are unsure if these will fit or if you can install them, you can purchase just one set at a higher cost ( sorry ) and test them on your drawers.
Of course if you want to purchase the minimum limit you can save a LOT of money by buying them here
Soft-Close Mechanism for 350 to 550mm (14" to 22")Metal Box Style Drawer Slides.
This kit is for one (1) drawer.
If you have slides that are that style chances are you will be able to use these to make them Soft Close.
No returns on this item.