Hi there,
To check the availability and compatibility of the stacking kit SKK-7A, you can contact Samsung's official parts distributor for customers purchasing Samsung parts or accessories.
Orders can be placed online at www.samsungparts.com or by phone at 800-627-4368; hours of operation are 9:00 am – 6:30 pm EST, Monday – Friday.
Also, the model number of the dryer that you are looking for is DV45K6500EV/A3. You may find the compatible dryer for the washer on the link below.
Samsung link
https://www.samsung.com/us/home-appliances/washers/front-load/wf6500-4-5-cu-ft-addwash-front-load-washer-black-stainless-steel-wf45k6500av-a2/
Have a great day.
^Aloe