It sounds / looks like it may have been this one for sale in 2007 - termis, single seat, marchesinis, dark d/b screen, light rear disk etc....
http://www.ducatisportingclub.com/sh...highlight=fila Not sure if Custard sold it then, but there's an email link on there that you could follow up.
I'm not sure there were too many Fila rep 748s either, the Fila sponsorship was for the 999 WSB bikes and this 748 would have been a homemade jobby.
HTH
Tim