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Probably like a lot here, I had a missing wiper arm cap. (where arm bolts to car) I tried a Hillman (from Lowe's) part H# 881289
7/8" nylon hole plugs black pack of 2 $1.39
They are too large, but if you cut out one of the segments (have 3 vent holes on each side of part that is inserted) and cut one slot on opposite side, but don't remove segmet, you will get a tight fit and it looks OEM.