Designed to fit with Keyser spoiler, part #100 907. Depending on series rules (crate/spec), use existing spoiler and add the 4″ extension to create a 12″ blade. Spoiler meshes directly to pre bent lip on 8″ blade. When bolted together, creates flush fit on front blade. 1/4″ bolts hold top and bottom blades together (bolts sold separately). Black finish. 56″ in length.