Yes, they are slimline weathershields, & yes RB20, they are speakers, but it's not a radio, that's the 8 track casette player. The white bit in the middle of it is an 8 track casette, & i think that the "knobs" are in fact, buttons.
The unknown items are the two cylindrical objects between the Casette player & the flares.
How could i have forgotten to mention the Slip-Over head rest on the left side seat.
Oh yes Sidedraught, it's all for real, all of these wonderfull items were indeed available for just that one amazing car. Those Engineers must have really loved this wonderfull little car, & I can readily understand why it must have been their favioite, what with it's clean sporty styling, light weight, nimble handling, low cost,... well, the list just goes on & on. It's so easy to see why it's no ordinary car.
Freak, the Steering Wheel was continued in production with a diferent mounting hub & horn button for the 1200 model. It was listed as the "Coupe, Sports Option" steering wheel & i have one that i hope to use on my sons 1200 coupe. The gear knob was also continued in production, but with a dogleg five speed pattern for the GX model.
Using KB10 parts really improves the look of the later models in my view.

Gosh Sidedraught, i have just realised why we have not heard about all the positive features of those ord.. I mean "other" cars that our fellow motorists have.
It's the KB10 effect,.... they all want one.
Well there is a nice one for sale on ebay right now with about 65,000 miles on it, & it looks to be in good condition at a VERY reasonable price. Now that's an opportunity too good to miss for the smarter Datsun owner.