The Passion IV was only introduced in 2008 - this is the only series that will fit the Hiscox case, previous series differ in dimensions therefore will not fit (all 'Vigier' Hiscox cases are specially designed to fit the instruments perfectly).
Hi, no, a '91 Passion is defiantly not a series IV bass and unfortunately we no longer have cases available for older instruments. The best advice I can offer, would be to visit a (good) local music store and see what they have that will work.
