Choosing Merc - help!

[Minty]

What is the oldest and most interesting Mercedes option for me if i have to have 5 seats each with a proper (3 point) seat belt..?

Suggestions welcome including aftermarket addition of a third seatbelt if this is indeed possible and not too expensive?

Cheers
Minty

[Minty]

Indeed, you are right but I have found that for a couple of hundred quid a 3 point belt can be added.