You will need to use 3m 8509 glass bedding compound on the front gasket. If you hire someone urethane is ok for the rear glass but do not use it on the windshield....if anyone says you can do not hire them. The factory also used clear glass sealer in both upper corners, and about 6" up the a pillar and across the lower glass. Most shops do not know this so it is best to supply them the 8509, permatex clear glass sealer, and the factory service manual if you want it leak free. I have had restoration shops tell me no sealer needed just the gasket....they could not be more wrong, so listen to what they say before you hire, or do it yourself because it is not worth the pissing match to try to educate someone who does not know what he does not know. It is a messy job and you need to tape off and cover everything. You also can not expect this to be a cheap normal install, it will cost a little more than a ribbon glue in. Good luck.