BenzWorld Junior Member
Date registered: May 2004
Vehicle: 1990 560 SEC
Location: United Kingdom
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RE: 73 280 se seatbelts recover seats need advice
I had the same thing with my old '74 450 SEL. If you are lucky, as I was, there should be fittings built into the chassis.
To check, do the following.
1. Lift out the rear seat squab. Do this by pressing the red buttons under the squab (1 each side), and simply lifting out of the way.
You should be able to see a couple of captive nuts that may have flat plastic bolts inserted into them. These are to take the centre lap belt.
2. To further check unclip and remove the side mouldings that cover the rear pillar either side. Behind these mouldings should be two captive nuts to take the top of the shoulder belts.
3. I think further captive nuts are just under the seatback but cannot remember!
These fittings were on mine, so I stripped the belts from a breaker and fitted them straight in.
You will need to change the side mouldings though, or cut them and trim them very, very, carefully. Your mouldings at the moment should have a shape embossed in them that a seatbelt would pass through. Obviously the belt cannot pass through unless these shapes are cut out. But if you cut them out there is a good chance you will chaffe the seat belt, so try to obtain second hand mouldings.