Question on seat padding

[MBeige]

Did all W123s come with horsehair padding from factory? Or were there some models that had the hard foam type?

Coincidentally, we got a good seat from the yard with a foam pad on it, so when we replaced the wagon's seat (ripped, torn, etc) the wagon also did have the exact same padding. I don't know if this is the coincidence part but the good seat came from a 1980ish car while our wagon is a 1981.

The sedan, however, has the horsehair pad which I just replaced via pool noodles and foam--and IMHO the procedure will only work successfully if you have broken springs.