My personal view is they are a pain in the bum and I wonder why anyone even bothers to include them.
I had nothing but trouble with them in the '65 and when I replaced the bonnet, chucked them to the sh1t house.
I never had any problems with rego and given the age of the vehicle, and numerous arguments available to prove they were a standard add on in their day, I agree with others that you will not get into strife with constable plod or the registration guys.
Don't shoot me down for my view on chucking them, it's personal view and really, every one of our vehicles is a reflection of our own personal tastes. If you want them, just do it ... with advice from the members on the best way of doing it.
If you are ever told to remove them, the pins can always be removed whilst the holes stay to satisfy the officialdom. After they are satisfied, your personal choice might once again come to the fore and the pins get reinstalled.