Help me ID/Source these random door parts please

[fishmunger]

Anyone know if there are aftermarket replacements and proper names for

1) the dome light door switch
2) the square 1/4” nut that goes behind the armrest
3) and this little rubber cushion that supports the inner door panel

And would someone mind telling me if my rear diff is ‘open’? I believe it is, but my spider says I have Posi, though the gears have been changed....

Thanks gang