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K&N Dual Flange Oval Tapered Universal Air Filters
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PartFlange Inside Dia. (F)Flange Center to CenterBase Outside Dim. (MA)Base Outside Dim. (SA)Top Outside Dim. (MA)Top Outside Dim. (SA)Length (L)Top StyleFlange Length (FL)
KA-25861.25 in (32 mm)3.125 in (79 mm)5 in (127 mm)1.875 in (48 mm)5.188 in (132 mm)2 in (51 mm)4.625 in (117 mm)Rubber0.75 in (19 mm)
RU-28502.125 in (54 mm)2.938 in (75 mm)6 in (152 mm)4 in (102 mm)4.5 in (114 mm)3.75 in (95 mm)4 in (102 mm)Rubber0.625 in (16 mm)
RU-28522.125 in (54 mm)2.938 in (75 mm)6 in (152 mm)4 in (102 mm)4.5 in (114 mm)3.75 in (95 mm)4 in (102 mm)Rubber0.625 in (16 mm)
RU-47102.375 in (60 mm)3 in (76 mm)6.25 in (159 mm)3.75 in (95 mm)4.438 in (113 mm)3.438 in (87 mm)6.75 in (171 mm)Rubber0.375 in (10 mm)
RU-47202.375 in (60 mm)3 in (76 mm)6.25 in (159 mm)3.75 in (95 mm)3.438 in (87 mm)4.438 in (113 mm)5 in (127 mm)Rubber0.375 in (10 mm)
RC-51453.125 in (79 mm)3.875 in (98 mm)8.75 in (222 mm)5 in (127 mm)6.25 in (159 mm)4 in (102 mm)9 in (229 mm)Stainless Steel0.625 in (16 mm)
RF-10123.125 in (79 mm)3.875 in (98 mm)8.75 in (222 mm)5 in (127 mm)6.25 in (159 mm)4 in (102 mm)9 in (229 mm)Metal0.625 in (16 mm)