I'm a vender for R/T specialties parts. Make sure you have the right clips for the 10 that go at the bottom of the front windshield. There are two types of clips that were used in 1968, one for early build date cars and another for later build date cars. I just did this same job on my 1968 Dodge Charger last Friday. My car used the early style clips as pictured above. It took two of us about 15 minutes to install the windshield. We used lots of windex, and a couple of plastic sticks. I swear it took us longer to lock the zipper seal than to install the windshield. I also used a new windshield gasket. Don't forget to use some butyl rubber? ribbon seal at the bottom of the windshield channel before installing the rubber windshield gasket.