Thanks, I rebuilt them myself and used the factory washer like the instructions said on the 5100s. I ll take a look at that siteDid you buy the whole assembly or get them rebuilt? It is a known issue that some shops don't reuse a clip from the old strut/shock to the new one causing the shaft to punch through the upper bushings. If this isn't the case then disregard. A lot of info on club frontier dot org.
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I think it was either the boot spacer or boot cover washer that is often not replaced.
Still sux either way. Hope it's not too costly of a repair!