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LM158: Output protection

Part Number: LM158


In the current design of line driver based on the LM158QML I need to provide its output tolerate to +/- 16.5 fault voltage from receiver both in ON and in OFF state. For this was used the next solution: 

But at worth case simulation I see that the voltage of OpAmp's output is very low.

If I really need these protection diodes (D7, D8)? Vcc=6Vdc and at simulation Vcc=0V.

The simulation was performed without diodes.

Best regards. Ilya