This thermostat is suitable for the folowing Opel models:

Astra F C18SEL, C18XE, C18XEL, X20XEV
Astra G X20XEV, X20XER, Z20LET
Astra H Z20LEH, Z20LEL, Z20LER
Calibra X20XEV
Frontera X22XE
Omega B X20XEV, Y22XE, Z22XE
Sintra X22XE
Speedster Z20LET
Vectra A X20XEV
Vectra B X18XE, C20SEL, X20XEV
Zafira A Z20LET
Zafira B Z20LER, Z20LEL

Comes with ring.

Suitable for the following models:

Antara 2.4 gasoline-motor (Z24XE)

Astra F 1.8 gasoline-motor (C18SEL, C18XE, X18XE, C18XEL)
Astra F 2.0 gasoline-motor (X20XEV, C20XE)
Astra F 1.7 diesel-motor (17D, 17DR, X17DTL)

Astra G 2.0 gasoline-motor (X20XEV, X20XER, Z20LET)
Astra G 1.7 diesel-motor (X17DTL)

Astra H 2.0 gasoline-motor (Z20LEH, Z20LEL, Z20LER)

Calibra 2.0 gasoline-motor (X20XEV, C20XE, C20LET)

Frontera A 2.2 gasoline-motor (X22XE)

Omega B 2.0 gasoline-motor (X20XEV)
Omega B 2.2 gasoline-motor (Z22XE)

Sintra 2.2 gasoline-motor (Z22XE)

Speedster 2.0 gasoline-motor (Z20LET)

Vectra A 2.0 gasoline-motor (20XE, X20XEV, C20XE, C20LET)
Vectra A 1.7 diesel-motor (17D, 17DR)

Vectra B 1.8 gasoline-motor (X18XE)
Vectra B 2.0 gasoline-motor (X20XEV)

Zafira A 2.0 OPC gasoline-motor (Z20LET)
Zafira A 1.7 diesel-motor (X17DTL)

Zafira B 2.0 gasoline-motor (Z20LEH, Z20LER)