[jgriff]

I found this somewhere. Written by the guy that wrote one of those Ducati history books. It would suggest an SPO is in a class by itself, and not an SP.

"Both of the SPO's (93 and 94) engines are identical in every
respect........including hp.
The real difference is in production numbers (both incredibly
small).
First
you have to remember that only the USA got the SPO or SPO LTD.
They were
the homologation examples used by Ferracci for AMA racing and I
suspect
that
he is the reason we got this special machine and the rest of the
world got
the 888S (Strada).
200 of the 1993 SPO's were produced, imported and sold in the USA
100 of the 1994 SPO LTD's were produced and imported into the
USA....but 25
were pulled back by Ducati N.A. were shipped back to Italy, when
the 916
hit the U.S. market in 1994."

Griff