...hhmmm.. Or, you can source an OEM factory glass top and frame from a 2003 or 2004 model yr. Boxster, and just unbolt your old top and bolt on your new one. Found one for $750...
Factory part, built in strap that holds the glass window completely out of the way when you put the top in service position (no limited access to the engine like the GAHH top), and a larger glass window due to the 4th rib in the newer top frame design...