Product review (3 stars): I found the recommended procedure difficult
First of all, this is something you don't want to "Mickey Mouse."  I made this mod for my daughter's gas dryer and safety was my top concern.  I found the recommended procedure difficult.  There are sharp edges and didn't see how one could get a good seal with the duct tape by reaching through the holes in the dryer side and back.  Regarding the kit itself, the piece that connects to the blower outlet and the 90 degree piece fit well.  However, the piece that goes from the 90 degree and out the side of the dryer was a loose fit, and when pushed firmly into the 90 degree piece, ends up being too short.  (The duct ends up being flush with the side of the dryer.)  Because of the difficulty and danger of the recommended procedure, and because the dryer needed a cleaning anyway, I opted to disassemble the dryer, removing the front and drum.  (More work but much less frustration.)  I'm glad I did because there was quite a bit of lint inside and I was able to assemble and tape the duct work securely.  With the drum out you can easily assemble and tape the three pieces of duct work together and install it as one piece.  But, test fit the duct work before taping.  As I mentioned, the piece of duct that came with the kit that is supposed to go out the side of the dryer was too short.  I decided to cut the original rear duct piece and use that, which worked perfectly.  (Tip:  much easier to cut the duct work with tin snips than hacksaw.)  Obviously you need real duct tape (the shiny stuff).  To complete the job I had ordered a pair of good clamps (Whirlpool vent clamps) and flexible dryer duct (Dundas Jafine ProFlex) from Amazon.  In summary, if you are determined to do the side vent conversion, then, despite the high price and short duct piece, I think you should get the kit, since it allows the duct to be secured to the dryer frame with a screw and you end up with a safe dryer and peace of mind.