Please Help Identify These Odd Leica Items

[polaar]

I cannot identify these items that were in a collection I acquired. Can anyone help out?

 

[HuubL]

Tpo left is a VALOO hood for the 50mm F/3.5 LTM Elmar. Originally meant for use as an easy aperture setting device for the lens used as an enlarger lens, but it's working great as a normal hood as well. Way easier to set the aperture than to fiddle the small aperture setting thingy around the front lens. The one top right is a similar hood but earlier I believe. Don't know about the chrome ring inside the yellow filter. Could be another aperture setting device. The filter itself is for the elmar and summaron LTM lenses.