Product review (2 stars): How to make the kit work- it's not right
Pull out the original pipe, save it.  Put the  new short piece in the dryer -it fits snugly and screw it into place. Before you do that cut the elbow piece so it will easily fit over the short piece. I found it to be impossible to slide over with making a few cuts with some snips.  Make sure you test fit this before you begin work inside the dryer.  Once I did the test fit, I discovered that the new extension piece out the side ends I/4 inch before the edge of the dryer which make it useless for attaching the hose.  So,,,, I measured it against the original vent hose and cut  the original to fit. It also has a metal clip to attach to the side of the dryer - just drill a hole and fasten with a sheet metal screw. Now I have space to attach the vent hose and it is secure.  I taped the elbow to this new piece after a test fit outside of the dryer and fed it through so I only had one connection to tape inside.  Ps.  You need to buy the silver tape ,it doesn't come with the kit.
So with this mod it works great, all it can say for the kit is that if I was handier, I'd buy the elbow and pipe and do it all myself for $50 less.  What were they thinking with this??