While cleaning out the 70 jack storage compartment, I see a pressed fiberboard construction item that appears to go on the end of jack for anti-raddle storage. This item with part # 391857 has a spot of glue on it, probably glued from factory. I searched arcives and my personal library of info., sales catalog, and have found nothing. It is illregular shaped measures 4 1/2" x 5 1/2". Has anyone seen this before?

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