Anyone know a decent window curtains to install? Maybe looking for a set up where the curtains can be easily removed and put back on...I only plan on using the curtains when the car is park since I am not entirely certain of California's law permitting curtains on the driver & front passenger side. What size should I get?

I know when I was looking at curtains I found a lot of good info here:

VIP Style
https://www.clublexus.com/forums/vip-style-188/

Junction produce makes curtains for the car.

Junction Produce size small. There will still be a slight sag though but not too big of a deal. You can have the curtains closed while driving in the rear only and have the drivers ones puled open.