Pretty sure S/Cs never came with a spare
.
On the street cars, they had a different trunk floor tray, that was more recessed. The full size spare wheel fit snugly into the tray. I have seen some cars with hold down straps, but I am not sure that was original. Ron wuold probably know better.
Here's a pic of a street car trunk with spare (courtesy of csxinfo.net)..
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Sal Mennella
CSX 4241, KMP 357 - sold and missed, CSX 4819 - cancelled, FFR 5132 - sold
See my car at CSXinfo.net here >> CSX 4241