Leon,
Technically speaking, no indicator stalk at all is the correct and original fitting for your car, being a Standard Sedan. I had a look at the photo I took of your car's interior, but it's not very clear on this point, so perhaps you can remind me. Is the indicator stalk an aftermarket attachment that is strapped to the steering column, or is it fitted into the slot in the collar behind the steering wheel?
If the former, then it's a valid and uncommon period accessory. (And if you want my opinion should be kept just as it is. We had several people come up to us at the All Holden Day and ask why your car had no front blinkers when all the other FEs did, and I think the aftermarket indicator stalk adds to that charm).
Having said that, it's your car, and you do whatever you want with it.
Hope that helps,
RET