AD 56382019 24" Side Skirt for Advance. Durable oil and abrasion resistant black neoprene side skirt. Fits older Advance Convertamatic 20B (Model 386002). Newer models require AD 56382905 (26"). Two required per unit. Priced Each. Replaces Nilfisk Advance 56382019, 382019. Our Part Number AD 56382019