This is a hazard switch.  This switch was UD21418 and UD21420.

1976-

CONTINENTAL

• Bentley Continental (SCBZD0001FCH09030 - SCBZD42A9FCX10372)
• Bentley Continental (SCBZD42A8GCX13412 - SCBZD00A2KCH29290)

CORNICHE

• Bentley Corniche (SCBZD0009CCH05822 - SCBZD0005ECH08901)
• Bentley Corniche Drophead (DBG31219 - DBG32204)
• Bentley Corniche Drophead (DBH22784 - DBH25394)
• Bentley Corniche Drophead (DBK50042 - DBH50707)
• Bentley Corniche Drophead (DBX34771 - DBG35465)
• Bentley Corniche 2-door Saloon (CBH22984 - CBX24291)
• Bentley Corniche 2-door Saloon (CBH31226 - CBH32490)
• Bentley Corniche 2-door Saloon (CBH34473 - CBH34473)
• Bentley Corniche 2-door Saloon (CBK50037 - CBL50497)

CORNICHE

• Rolls-Royce Corniche (SCAZD0002GCX14109 - SCAZD0001HCH21668)
• Rolls-Royce Corniche (SCAZD0006CCH05037 - SCAZD0008FCX10371)
• Rolls-Royce Corniche II (SCAZD42A5GCX13162 - SCAZD02A8KCX29289)
• Rolls-Royce Corniche Drophead (DRH22583 - DRE26705)
• Rolls-Royce Corniche Drophead (DRH30003 - DRH33027)
• Rolls-Royce Corniche Drophead (DRH50003 - DRH50757)
• Rolls-Royce Corniche Drophead (DRX33029 - DRH35878)
• Rolls-Royce Corniche 2-door Saloon (CRH21998 - CRH21998)
• Rolls-Royce Corniche 2-door Saloon (CRH22648 - CRE26703)
• Rolls-Royce Corniche 2-door Saloon (CRH30011 - CRG33028)
• Rolls-Royce Corniche 2-door Saloon (CRH33031 - CRH35807)
• Rolls-Royce Corniche 2-door Saloon (CRX21729 - CRX21729)
• Rolls-Royce Corniche 2-door Saloon (CRX50004 - CRX50694)

EIGHT

• Bentley Eight (SCBZS800XFCH12013 - SCBZE42A6HCX16954)

LIMOUSINE (1980-2000)

• Rolls-Royce Silver Spur Limousine (SCAZN42A3FCX12040 - SCAZN42A2HCX16941)

MULSANNE

• Bentley Mulsanne (SCBZS0000ACH01009 - SCBZS0000ECH10044)
• Bentley Mulsanne (SCBZS42A9FCX12094 - SCBZS0009GCH16928)
• Bentley Mulsanne L (SCBZN0008BCH02485 - SCBZN42AXDCX06857)
• Bentley Mulsanne L (SCBZN42A6FCX12397 - SCBZN42A7HCX16767)

SILVER SHADOW II SALOON

• Rolls-Royce Silver Shadow II (SRF30001 - SRH34574)
• Rolls-Royce Silver Shadow II (SRH34575 - SRL41601)

SILVER SPIRIT

• Rolls-Royce Silver Spirit (SCAZS0000ACH01001 - SCAZS0007ECH10126)
• Rolls-Royce Silver Spirit (SCAZS42A3FCX12001 - SCAZS0001GCH16930)

SILVER SPUR

• Rolls-Royce Silver Spur (SCAZN0000ACH01006 - SCAZN000XECH10127)
• Rolls-Royce Silver Spur (SCAZN42A6FCX12002 - SCAZN42A9HCX16970)

SILVER WRAITH II

• Rolls-Royce Silver Wraith II (LRG34601 - LRL41648)
• Rolls-Royce Silver Wraith II (LRX30083 - LRX34563)

T2 SALOON

• Bentley T2 Saloon (SBH34775 - SBH41573)
• Bentley T2 Saloon (SBX30046 - SBH34556)
• Bentley T2 LWB (LBH31044 - LBH34314)
• Bentley T2 LWB (LBH35653 - LBH39200)

TURBO

• Bentley Turbo RL (SCBZN0T08FCX12884 - SCBZN0T05GCH16170)
• Bentley Turbo R (SCBZS0T0XFCH12834 - SCBZS0T09GCH16570)
• Bentley Mulsanne Turbo (SCBZS0T05CCH04233 - SCBZS0T09ECH10099)
• Bentley Mulsanne Turbo (SCBZS0T08FCX12005 - SCBZS0T08FCH14162)
• Bentley Mulsanne Turbo L (SCBZN0T04DCH06872 - SCBZN0T09ECH10062)
• Bentley Mulsanne Turbo L (SCBZN0T05FCH12957 - SCBZN0T01GCX15787)