[MBZ] W126 seat interchangeability?

[kevin kraly]

As many of you know, I've been looking for some better seats for my 300SD. 
I came across several seats out of similar gasser models (420SEL, 500SEL and 
560SEL).  Will these fit into my 300SD?  I figure it may be worth a try 
since there aren't as many high mileage gassers out there.  Gasser S class 
seats are more prevalent.

Kevin in Hillsboro Oregon
1983 300SD 284k miles, Ursula