Mercedes made it possible for the (R129) SL to exchange only the rear part of the soft top when the rear screen is blind.
The soft top exists out of two different parts; the back part with the screens can be renewed separately (for a reasonable price).

I think that it is possible as well to have the rear screen renewed by a specialized (camping) shop as well, but...I don't know whether I would like that.

greetingz,

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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)