EVO VIN: Good question. Depends on if the parts are rare and really not used on ANY other model. If you wanted them, it wouldn't hurt to try and order a set. Worst they can say is "no"!
Go Kart: So you want zero body roll, right? I would think W201 aftermarket race springs might be the best choice, followed by 124 Sportline. I still think 500E springs are a step in the wrong direction, but I guess you'll let us know how they work out!