You could always make up a sleeve that is sewn like a pouch that slides over the sunvisor. You can store it on the visor and when you flip the visor to the driver's side window you can pull the sleeve out along the visor to block the sun. I did this on my 85 300D and it works great! Of course I got matching color vinyl and my upholstery buddy did it on his industrial sewing machine. The material has to be stiff enough to not be floppy.

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Pete Williams, President emeritus - MBCA-International Stars (Eastern Mich.) Now Wi. & Az.
1985 300D Manual 4 speed Green Hen's tooth
1979 MGB triple black Az car nice
1969 back 1/2 of MGB (Az home built trailer)
1991 Volvo 245 Wagon Nice AZ Restored Gold Brick
1983 Jeep CJ7 37,600 Miles Summer use only