You have a sharp eye Bradley, but if you look close, those arent SVO sail panels, they are sail panel covers.
Saleen planned to use them on all the aero cars, and actually installed them on a dozen of so of the first 1987 Saleens built. They quickly found the tape used to hold them on didnt stick well, and they fell off while driving. If you look in the Saleen registry, the majority of cars in 1987 are listed as "sail panel (d)".
This is a picture of a preproduction 1987 Saleen. Notice the sail panel covers and prototype 5 star wheels that didnt show up till late 1988 production.
I always liked the look of the car in the above picture. I bought a set of the sail panel covers years ago when they were readily available and figured out a way to get them to stay in place.
Its not original to my 1988 Saleen, but its original to the way the car was meant to look.
#583 is not 100% factory correct, but anything I have changed has been in the spirit of the original (or later, in the case of the vortech supercharger, which was optional in 1992 and 1993) Fox Saleen Concept. I have had the car going on 17 years and it was my daily driver for the first 5 of those, that made me not as concerned with originality as some would be.
Check out the SCOA website and forum, more info on fox Saleens than you can shake a stick at.
http://www.saleenclubofamerica.com/
Hopefuly I will have more work done on the saleen model soon, You guys have inspired me to make it more acurate.