www.heimracing.de Click on Ducati on the left side of the home page and go into original Ducati exhausts. There you will find them listing Termi end cans for the SP5 at the knock down price of 350 Euros down from 539 Euros.
The standard cans on the SP4 were actually made by Termignoni - but don't bear the badge. My own bike has these original cans fitted, and it's a good deal louder than the carbon race cans fitted to my Strada!
BC, I guess you got to the ducati name on the home page ok. Click on "auspeffenlangen Ducati", when the page comes up, go to the centre of the page and click on the "original auspuffenlangen Ducati", which is printed in yellow type, 4th of 4 in a list. Scroll down to the Termis, after the 916 and monster stuff. Any probs come back to me. Gary.
Looks like it may just be the right hand side. I guess the only way to be sure would be to mail them and ask. Their english will be a lot better than my german