I remember reading a post where it was done with 1/8 inch steel brake line.

I just went to Pick N Pull and found good springs from passenger side. One a 123 both seats use the same springs.

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Charles
1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/mercedes-benz-cars-sale/296386-fs-1-owner-83-mb-300d-turbo-rebuild-parts.html