510-523 SuperLite 17 Head Cushion Foam Replacement Kit 510-523 Part # Description Qty. 510-610 Head Cushion Foam, Top 1 510-611 Head Cushion Foam, Left 1 510-612 Head Cushion Foam, Right 1 510-613 Neck Foam 1 510-523_SL_17_Head_Cushion_Foam_Replacement_Kit.pdf