Dimensions of the Available AEM Oval Straight and Tapered Air Filters:

Part # Flange Inside Dia. (F) Length (L) Base Outside Dim. (B1) Base Outside Dim. (B2) Top Outside Dim. (D1) Top Outside Dim. (D2) Top Style Flange Length (FL)
21-2145DK 3.5" 5.5" 8.5" 5.5" 6.25" 4" Rubber 1.563"
21-2257DK 4" 7" 12" 12" 8" 8" ABS Plastic 1.5"
21-2259DK 4" 9" 10.5" 8" 9.5" 6.75" ABS Plastic 1.5"
21-2267DK 4.5" 7" 10.5" 8" 9.5" 6.75" ABS Plastic 1.5"
21-2269DK 4.5" 9.313" 5" 9" 9.5" 6.75" ABS Plastic 1.5"
21-2277DK 5" 7" 10.5" 8" 9.5" 6.75" ABS Plastic 1.5"
21-2278DK 5" 8" 8" 10" 9.5" 6.75" Metal 1.5"
21-2279DK 5" 9.313" 10.5" 8" 9.5" 6.75" ABS Plastic 1.5"
21-2288DK 4.5" 8" 10.5" 8" 7.75" 5" ABS Plastic 1.5"
21-2258DK 5" 8" 10.5" 8" 7.75" 5" ABS Plastic 1.5"