SX150 choke lever and fuel tap lever

Hi,
I have a 1967 SX150 that has come with a aluminuim choke lever/knob with black plastic body assembly which looks like it would be right for age but the petrol tap lever has a black plastic knob / lever. Would it be normal to have this mix? Any thoughts anyone? Thanks in advance.
I have a 1967 SX150 that has come with a aluminuim choke lever/knob with black plastic body assembly which looks like it would be right for age but the petrol tap lever has a black plastic knob / lever. Would it be normal to have this mix? Any thoughts anyone? Thanks in advance.