The triangle piece acts like a button that you can press down to be able to remove the head rest or move it up or down. Theoretically you can do without it and have the height position permanent. The wagon setup is different.

Wagon Headrest.


Left Sedan Headrest and Right Wagon Headrest


Sedan Rear Seatback with Headrest.


Pictures are from here. http://www.detali.ru/cat/cats/?cat=mb

The last I checked, my local dealership found a 100 of these triangle pieces in Germany. But was not able to access them. Maybe your dealership is better and can order them. They however could order the whole mounting kit which includes the parts shown in circle 5 in the above pic. That part number is 123 970 01 00 and was listed at $59.29 for each side.


One question to you Squabble for clarity, you stated you have the two straight frame supports. There should be four (4 qty) supports. Two are removable and the other two are spot welded from the factory.

Attached Thumbnails

     

__________________
1983 123.133 California
- GreaseCar Veg System

i see. i was stating that i had the two factory spot welded long supports that came with my car in the seat. i also made the wrong assumption that the triangular pieces were attached to another long support and that it was one piece. from the pics i see that there is one support and one triangular piece. what does that triangular piece attach to? isn't number 108 in the top sedan picture the same as number 20 in the bottom picture?

but, i guess none of that would matter if i didn't mind that they weren't adjustable. i could put rear headrests in if i had only the pair of headrests, the eyelet mouldings, and the set of brackets that attach the headrests to the factory long supports in the back of the seat...? for clarity, i'm talking about having only the things shown in this ebay auction:

http://cgi.ebay.com/VINTAGE-MERCEDES-W123-W-123-REAR-HEADRESTS-HEAD-RESTS_W0QQitemZ400045035072QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item5d248ace40&_trksid=p3286.m63.l1177
(i'm not bidding/buying this fyi, waaaayyy too expensive).

would that work? basically everything but the triangular pieces equals rear headrests that don't adjust. i was under the impression i would need an extra long support for the back of the seat, like in this auction:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=260409042845&_trkparms=tab%3DWatching

4 total rear supports in that lower picture. but that doesn't even exist in your picture. thanks for the help!

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1985 300D - 1984 Euro 280E AMG Clone (SOLD) - 1978 280CE (SOLD) - 1983 300D (SOLD) - 1981 300D (SOLD)

deliveryvalve,

i'm curious about the 1st pic in your 1st post: it has 4 total long supports showing, two for each head rest. but the pics you just posted only have 1 post showing and one of the sliding post on the headrest just seems to slide down into nowhere inside the seat. that's what i'm curious about, do you need the extra long support too?

__________________
1985 300D - 1984 Euro 280E AMG Clone (SOLD) - 1978 280CE (SOLD) - 1983 300D (SOLD) - 1981 300D (SOLD)

Yes they are not the best pictures that represent what is actually there. Go by my earlier pictures. They are actually one side of one headrest post.

__________________
1983 123.133 California
- GreaseCar Veg System

It attaches in front of #60 (in the middle pic) or #17 (in the last pic), which is sandwiched in between by the long frame support.


yes
With this you would still need the other two long bracing support as seen in this pic I posted earlier.




Plus you will have to make sure they include the bottom "lockdown" pieces of the eyelets.



Yes this would work.




.

__________________
1983 123.133 California
- GreaseCar Veg System