Part is AC Delco brand. All years/models this fuel pump will fit:
ACDELCO Part # EP311
BUICK PARK AVENUE ULTRA (1991 - 1995)
OLDSMOBILE 88 ROYALE LSS (1995)
OLDSMOBILE 98 REGENCY ELITE (1994 - 1995)
OLDSMOBILE 98 REGENCY TOURING (1992 - 1993)
PONTIAC BONNEVILLE SSE (1992 - 1995)
PONTIAC BONNEVILLE SSEI (1992 - 1993)
looks as if it just might work....
was the Regency an Elite? meaning was it also a Vin 1 supercharged car?
Though this fuel pump is the same in non-supercharged Bonneville'* so it may not make a difference.