I am preparing to replace front and rear bushings on front control arms on my daily driver 2006 Jetta TDI. I am planning to stick with rubber units due to discomfort of polyurethane but looking for slightly firmer than stock. Are there any differences between the dozens of replacement rubber bushings available? Is it best to stick with genuine VW replacements? I understand the S3 bushings work well with better control and slightly firmer than stock.