Doug, re the big rear window and a cage, a few owners have taken the easy way out and simply used a plastic rear window, which drills with a hole saw. Federal law says that IF glass is used in side and rear windows, it must be tempered. But plastic is not specifically illegal. AS far as protection in the event of a fire, it seems the rear glass shatters immediately on contact with a flame anyway, so its of no more protection than plastic. The only place I know where plastic rear windows are illegal is at Bonneville. PPC-Carson City has UV-stabilized Lucite rear windows in stock for street cars mostly as a cost savings, but there's a substantial weight savings, too.
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