The grommet (a metal o-ring) was used at the bottom of the turbo model strut tubes.

Also, if you used KYB struts as replacements, these have journals on the piston shaft which cause a clunk over the most minor of road roughness. Solution is to spin off the top shaft nut (underhood) and slip a couple of thick washers under it. This takes up the gap between the journal and the underside of the strut bearing.