Roderick,
I was doing some research into this myself. I sent an e-mail to Italy a few days ago but have not recieved a reply yet on this set:
http://www.termignoni.it/catalogo/sched ... 20STR%2040
Possibly the fact that you are a little closer to Italy and Termignoni they may give you an answer sooner? I am thinking that these will work if you make your own mount brackets (items 3 and 4 in the picture).
It is listed for a 750SS from 1989. These bikes both used the same motor (Pantah 750) what I was trying to determine is the exhaust size in mm. This should be a 36mm correct for Paso 750. If it is available and it will work please let me know. The next possibility is a Conti system
http://www.dropbears.com/o/overlander/d ... hausts.htm
Again you will need to order from Australia.
These are the only ones I've found so far unless you are lucky enough to have the 40mm exhaust (rare on the 750) then you can use the 907ie exhaust system from Two Brothers #005-160406D.
http://www.twobros.com/cgi-bin/shopper? ... 907ie.html
All are expensive!
I hope this helped some and if you get any information please pass it to me.
Doug