Mygrant doesnt install, They are a wholesaler. They do not have one general number. The main corp number is for California so you will have to look up the number where you are.
Here is their website:
https://www.mygrantglassonline.com/
Locations:
https://www.mygrantglassonline.com/p...px?p=Locations
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Make sure they clean the glass and body very good. Urethanes are not compatible with butyl and will not adhere correctly. The glass MUST be primed even if they say its primerless to glass. Do not let them glue over rust or butyl. Also keep in mind they will probably not give you a warranty. I never would warranty used glass installs. But then again I wouldnt install used windshields either.