Raid,
Don't know about smaller item, but the first item appears to be a part of the "helical focusing mount", which mounts the Elmar lens using the bayonet lugs of the lens barrel ( lens is attached with the LTM focusing mount in the "collapsed" position ).
This gizmo is used with the Focaslide for close-up work. The size & shape looks right - is it ridiculously heavy for a lens-hood ?
Luddite Frank