OTR Filters Sprint Car Rectangle Air Filter Element - 20.3 in L x 14.74 in W - 5.25 in Tall - White 3213 You can check to see

You can check to see which you have by measuring the distance from the base of the mount to the center of the through bolt hole

Oftentimes the hammering created nicks along the edge

GM V6 / V8

*LH support features a small kick out for added header clearance

For the future

OTR Filters Sprint Car Rectangle Air Filter Element - 20.3 in L x 14.74 in W - 5.25 in Tall - White 3213 You can check to seeProduct Description: Air Filter Element Rectangle 20. 3 in L x 14. 74 in W 5. 25 in Tall Paper White Sprint Car Sold Individually US based OTR Filters was founded on developing air filtration solutions that help engines breathe easier, run faster, and perform at their best. With a wide range of filters for everything from street performance to hardcore racing, OTR Filters combines excellent performance with maximum engine protection.