Quick view Add to Cart Elimination of Holes in Firewall, Addition of Control Cable Seals - Replacement of Dural Plates & Fittings w Steel Plates & Fittings Document Part Number: Service Bulletin No. 258 Number of pages: 12Part Number: Service Bulletin No. 258Revision Date: 10-Mar-1948Description: Replacement of Fluid Carrying Lines Forward of Firewall w Steel or Fire Resistant Flexible Hoses MSRP: Was: Now: $15.00