This is a replacement metallic gasket by Skyline Emissions Inc. It is used on DPFs used on Caterpillar C7/C9 and C13/C15 engines. This gasket is applicable with both Skyline and OEM part numbers. <BR<BR Applicable Skyline Part Number:<BR A-CPXH-CQ1704<BR<BR Applicable OEM Part Number:<BR 304-7502, 304-7519, 10R-7056, 291-8519, 294-8694, 10R-6089