A n old fellow in my Mercedes Club here in Miami has a 1982 300D with Recaro seats, a 5-speed shift and Euro lights.
The seats seemed to fit the car just fine.
He was planning to sell the car (about 120K on it) for a bargain $6,000, or so he said.
I have seen Recaros on E-Bay. I assume ther is some way of adapting aftermarket seats safely to any Mercedes that they are made for.
Semibodacious Transmogrifications a Specialty
1990 300D 2.5 Turbo sedan 171K (Rudolf)
1985 300D Turbo TD Wagon 219K (Remuda)
"Time flies like and arrow, yet fruit flies like a banana"