As the others have said, the answer is yes, Saleen did produce a few notchback coupe Saleens.
According to Saleen lore, the first one was produced in 1987 for Austin Craig who worked for the advertising firm that handled FoMoCo's corporate account. It was intended to be a one-off model, but others were produced throughout the late 80's.
About six months after I purchased my 1989 Saleen Mustang, my next door neighbor showed up one day with a notchback Saleen that was eerily similar to my own. The only difference was mine had the 5-spoke ARE wheels while his had the mesh ARE's, but everything else was identical; e.g. white with silver graphics, gray interior, white wheels & the rocker stripe delete. My s/n was 0408 while his was 0612.
Oddly enough about 6 years later his vehicle appeared for sale in Hemmings Motor News. I don't know if he ever sold it because he was no longer my next door neighbor.
I owned a Saleen coupe...88-400.....Black with silver graphics....it came with mesh, but I purchased a set of 5 stars from saleen for it in the early 90's.......it was a great car......I now own 89-258.....convertible......black/black top.....silver stripes...6000 original miles......MINT.......I put original 17" saleen 3 piece wheels on it.....have the original wheels and tires in storage.....I tried to upload a picture but the file was too large.
These are the best pictures I can find on short notice of mine. It's a 1991 coupe (#65), and it was ordered with the rocker stripes deleted. The SSC stripes were applied by the original dealer (North Central Ford in Dallas) at my request prior to delivery.
The car has just over 26K on the odometer, and came out from long term storage this past week. I'm very anxious to start enjoying her again on a very limited basis.