Anyone have any experience replacing the rear, third seat, seat belt assembly?

Also, there are receptacles on the reg. rear seat that look like ports (circular) that "something" must plug into. These are not electrical, but look more like seating restraints or maybe for an optional separator for animals etc..?

Any help would be appreciated!

What year wagon?

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles

Since it's an E320, he must be talking about a late 124 or 210 car. I've had one of each so far.

You're not missing anything important. The plastic receptical (as you call it) is for holding the latch when the seatback is folded down. When new, there were some rubber band type contraptions which held the latch in that receptical. The latch had to be pulled out to buckle the belt, and would snap back when the belt was unbuckled. The third seat has the same setup.

Over time these things seem to have given up the ghost - likely the rubber fatigued and broke. I never looked into replacing them - they are strictly for convenience and appealing to the German engineers obsessive compulsive syndrome. Dealer might be able to get them if you wish.

- JimY