#16 above is a "recreation" of CSX2259 pre-Sebring (1964). In the SAAC Registry the "FIA" or "USRRC" Cobras as being shipped were listed as being delivered with "wide rear wings" but no reference was made to the front arches so I would think that the front arches were standard street arches that were modified by the individual crews that were assigned to them, as were the
oil cooler scoops. If you "study" the photos of 2259 & 2260 in 1964 Sebring photos you can see hints of the original body lines before the flare job. CSX2345 (#21) would be a good "study" for flare dimensions.