Soft top frame detail

[mbzse]

I am currenly adjusting my soft top frame (280SL).
I am a bit confused regarding the small round rubber buffers, one each side, that are situated above the side window at the rear, as an extension of B pillar you could say.
Discussed and depicted in these threads: https://www.sl113.org/forums/index.php?topic=22588.msg161494#msg161494 and https://www.sl113.org/forums/index.php?topic=8940.msg58769#msg58769
However, what is the purpose of these buffers(?). As I fold soft top frame up and down, I do not see the buffers touching any other part(?)
Peculiar. Can anyone comment on this
/Hans S

Pic below same as in the old threads mentioned; courtesy of Alfred E and JeffC

[Cees Klumper]

Extra head protection in a crash? Sorry, couldn't  resist ;-)
I don't know what these do but will check my frame later today.

[Jonny B]

Hmmm, most confusing. I just went out to look at my car, thought they were an anti-rattle kind of thing, but sure does not look like they make contact with anything.

Curious indeed.

[66andBlue]

Hmmm ... not confusing at all ... when you have a "naked" 230SL frame. 
Before stowing the top away the rear bow is folded upward to be locked in while the front part is still somewhat straight.
As can be seen in the right panel the rear bow presses against this buffer.
In this position one can also easily check whether the frame is bent because the rear bow should hit the buffers on both sides.
When folded completely and resting in the compartment (left panel) then I guess only the fabric is in contact.
Don't know whether this is the same on a 280SL frame.