Product review (5 stars): Still making parts that fit after all these years...
In 2002, I bought a Whirlpool Duet washer (GHW9200LQ) and dryer (GEW9200LQ0) set after return from overseas assignment in Germany.  They stayed in Texas for 11 years during my tours in Virginia, Iraq, Kuwait, Japan and Kansas. We moved into our forever home Jan 2015, and because we now also have a freezer and our old side-by-side in the laundry room, I researched stacking to make space for everything.
I was concerned because of the age of my set, that any kits I would find would be for much newer models.  Was able to find the kit for the dryer, but the product description was silent about the type of washer it would work with.  But hey, I had a 50/50 chance.
Ordered the kit, it arrived in 2 days as promised.  Instructions were straight forward.  We already had the dryer on top of the washer.  We simply tilted it back, my husband held on to it, I installed the glue-on strips, then slid the dryer back about an inch past the washer, installed the plastic clips, then the steel brackets.  Perfect fit!  Key: The dryer cannot sit on top of the washer aligned at the back.  It has to be offset by an inch otherwise the brackets will not fit properly, nor hold the dryer in place.  This is on purpose, so access to the detergent/bleach/softener drawer is not hindered.  Also, if you do not have it offset, or don't have it offset enough, the brackets will not fit properly.  After I initially installed the brackets, I nudged the dryer back a hair to ensure the brackets were seated snugly, then tightened the screws completely.

I am running my first load now.  Standing in front of the stack during the spin cycle.  Since the washer is no longer on the pedestal, it makes so much less noise during the spin.  The dryer shifted about 1/16th of an inch at the right front corner.  I will just have to remember to check after each load and nudge it to back into position.  Small price to pay for the extra space.

So now I had two pedestals taking up space...i stacked them on top of each other and we put our upright freezer on top of them.  I still have the drawer storage space and now no longer have to bend over to get to the bottom shelves in the freezer.
We will close off the outside vent pipe for the dryer and purchase an indoor vent-less dryer kit.  The climate in Southwest Texas is very dry and could do with some moisture and in the winter it will generate some extra heat as the laundry room is pretty far from the furnace.
I took some photos, but have to post them from my tablet or laptop as it does not give me the option from my cell.