Congratulations..... I'm sure you'll get smarter answers then I can supply. But let me say, be very happy that you have a dual master on the brakes. I have everything original and when the brakes are adjusted and bled all around the pedal rides high and activates with very little pressure.... can stop abruptly when creeping or going slow... but stopping at higher speeds you must apply greater pressure... it's something I get use to.

Don't know what the add on toggle switch is..but there are two vacumn swithes operating the radio antenna.

Your front shock upper end is connected to the frame. The lower end is attached to a mounting bracket to the lower suspension arm. The rear shock is mounted above the leaf spring.

Have Fun.