I can't remember exactly where I got the spring from, just as long is it has a decent compression rate and will fit around the damper. As for the shock and tensioner, I don't remember, I think the shock could be Sachs. The tensioner is Uro brand that I just replaced in December 2023 . If you go with Uro brand, make sure you do this mod otherwise you will be replacing it again in a year or so. The tensioner is actually a warranty replacement from a previously failed Uro tensioner after about 2.5 years. However, doing this mod, it won't really matter if the tensioner fails because the spring will be holding the tension on the belt. This may actually extend the life of the tensioner itself. I opened one of these tensioners up and found that it's nothing more than a giant rubber bushing. The torquing of the tensioner is nothing more than the rubber inside being twisted and wanting to spring back to it's original mold is what provides the tension. No idea why MB wouldn't just use a large spring for this.

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1990 190E 3.0L