Doncat,
Contact Joel at Official Hi-Lo Repair. He purchased a bunch of the factory parts inventory and claims to have the blueprints and parts source info. If he doesn't have the shields in stock, he may know where to get them.
I've E-mailed him about day/night shades and have received quick responses. As far as the shades go, his prices seemed very reasonable... less than they cost at big orange. There are hot links to his website in several different places in this forum.
Good luck,
Jim