Gary,
I just purchased these also and the long & the short of it is
the long & the short pieces are for the top & 2 sides (you have to cut the long one)
these are called the Bailey channel
Then.... you have to also buy what they call the door belts, and just to confound you they are 1 to a pack but you need 2 per door!
Why they don't put them all in one pack & save you some dosh on packaging is a mystery to me, as I can't see why anyone would only want to buy half or a third of a kit
Good luck with it, & be careful with the door belts, make sure the little bullet clips are clamped tight to the strip, otherwise if they stick out too far they will scratch your glass when you wind up the window as happened to me.