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I've been doing research online to try to find a solution and it looks like some people with W123s have tried to build their own solutions by welding, drilling, etc. That is way out of my league. I'd be very curious to hear from people who have managed to find a solution to this problem.
As background about my mechanical abilities, see this youtube video. Sorry, I can't figure out how to embed it. So I guess my computer skills are also pretty bad.
https://www.youtube.com/watch?v=9lphrw69lcQ
Just be glad the E500E isn't a two door!
I remember when I was a kid how much I liked riding in the back of my dad's toyota landcruiser. Child seats? It didn't even have seatbelts. Or seats!!! I sat on a toolbox.
I talked to a parts guy at a dealership and he found listings for parts for "child seat mounting". Two nuts (210-984-0025), two rivets (910-002-004105) and a threaded chuck (124-984-0525). He didn't know what exactly these parts would be used for or how they would be installed. The threaded chuck is clearly for the rear seat belt assembly (http://www.mbpartsworld.com/p/__/THREADED-CHUCK-THREADED-INSERT/7625682/1249840525.html) but it's not clear this does anything to set up a baby seat tether system. Anyone have any insights?
As the child ages there will be a point when you will graduate to the kind of a seat that wants to have the top portion fastened to an "anchor" located behind the top of the upper rear seat. Only our W124s are too old and don't have them. (At least my '93 didn't.) There is a funky bolt kit available from the dealer that, when combined with extra pieces that come with the baby seat, will create the proper set-up.
I have come up with some appropriate parts to retrofit a top tether. I will get into my own car and see what the most appropriate spot might be. Threaded bores for this retrofit may already be in place in the hat shelf metal. I'll let you know what else I find out. Stay tuned...
OK, I have more to add to this thread!
When I posted the stuff above, I mentioned that I was using a Britax base. Turns out that this was smart, because Britax has a built in seatbelt "lock off". Essentially (you can read about this on the web, but it is a little confusing), before 1996, seat belts were allowed to work different ways. Some would lock "pre-crash" meaning once you pulled it out and let it back in a bit, it would lock. Some only lock when you are IN a crash. the Mercedes seems to have the latter type. Who cares, right?
Well, when you install a car seat using the seat belt, you obviously need it to install tight, and then LOCK there. So if you buckle the car seat in (essentially by looping the seatbelt through some special hole in the car seat, or the base) it will NOT "lock" in place.
One way around this is to use a car seat base with a built in "lock off". What this is is a little "clamp" thing that clamps both the lap part and the shoulder part of the belt together. So you tighten the heck out of it, then clamp it down, and it cannot move.
This is confusing even to type, let alone read, so look at this page:
http://www.britaxusa.com/learning-center/superior-ease-of-use/built-in-lock-offs
Talks about "built in lockoffs"
So the base I use looks like this one... You can see the "lockoff" is the grey thing in the middle with the belts passing through it.
http://www.rei.com/zoom/gg/a8bf1264-6882-4086-9df2-3b4913f3607c.jpg/440
Hope this helps clarify how my seat is installed.
What about me? I'm the one who turned you on to the top tether part that Klink is now pursuing.
Any reason you can't just tether to one of the head rest posts? That's what I had my kid's forward facing seat tied to (together with the ratcheting clip replacement) when we were hit head on by the Toyota Sequoia.
I think my wife will want an "official" solution to the tether issue. From your experience it sounds like using the head rest post might be safe, but I'm not sure that will be enough for her.
As mentioned above, the Recaro doesn't have a built in "Lock-off" clamp, so I had to use one of these:
http://contentinfo.autozone.com/znetcs/product-info/en/US/drm/74356/image/3/
Bumping this back up. I now need to turn my car seat forward facing. Klink, any update on bolt kit for the top tether?
Ok, I found the spot Klink took a picture of, and it looks like that is correct, but the issue for the 500 is that it is in the CENTER. That would mean that the seat would have to go in the middle of the rear seat, which is obviously a no-go.