You know what seats are really really nice R129 SL seats, they fit like a glove.

I just put some Mercedes w123 seats in my friends ford festiva, I got some festiva seats that you could have =)

I think you should look into Corbeau seats, they are really nice, see dean albrecht's post on racing seats in the 500E. Lots of great comments there.

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Current Stable:
1994 S500 v140, 210k miles, white with grey.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold (rumor has it, that it has 750k miles on it now)
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 "300E" Amg Hammer 88k mi sold (it was really a 200, not even an E (124.020)
1992 500E 156k mi sold
etc.