Product review (5 stars): Samsung SKK-7A - Stacking Kit for Samsung 27 in. wide Front Load Laundry Pairs -Supersedes the SKK-7K kit
Lowes could not get the Model # SKK-7K stacking kit for the two Samsung units I ordered from them. They were back ordered. They told me to try finding Model # SKK-7K kit myself. My searches showed Model # SKK-7K as discontinued and the Home Depot site redirected to me the SKK-7A  kit as superseding the 7K kit. It turned out to be the correct alternative and works beautifully with Samsung 4.2-cu ft High-Efficiency Stackable Front-Load Washer with Steam Cycle (White) ENERGY STAR with matching dryer. This stacking kit is way superior to the 'stacking kit' I had on my previous 10 year old Whirlpool Units. This kit literally secures them together with no movement. I recommend it