Just a brief follow-up. I now have one of these 'custom' foam-cored sunshades for each of my i-MiEVs, material cost under $10 and just a few minutes with a pair of scissors. The athwartships bungie has large loops for the mirrors and the fore-aft bungie has small loops - one around the radio antenna and the other around the windshield wiper base.
Now, this last week in SF it was too windy to have the cover outside (even with the bungies), so I was pleasantly surprised that the same cover fit very nicely inside the car. The note says at what time I could be unplugged (I was expecting to be in a meeting just a little longer than sufficient charge for me to get home) - sure enough, a Leaf was using the plug when I returned as the parking spot next to me had been available.
EVs: 2 Wht/Blu SE Prem., '13 Tesla MS85, 3 156v CorbinSparrows (2 Li-ion), 24v EcoScoot(LiFePO4)
EV Conv: 156v '86 Ram PU, 144v '65 Saab 96
Hybrids: 48v1kW bike
ICE: '88 Isuzu Trooper. Mothballed: '67 Saab (orig.owner), '76 MBZ L206D RHD RV