Would think that while the l67 was available in the vs , don't know of any utes with one = ( still a work vehicle/ povo pack),standard = option.
So guessing, strictly speaking, yes a certificate.
Would think if you have it fairly standard/ factory looking wouldn't be a problem, just hassle/ time/ money.
They were pretty much still viewed as work vehicles then.
It was only in that period, around 2000 / 2002 that Holden cottoned on to utes = young blokes = a version of a sports car.
The trial was the late vs ss utes( collectors now = maybe).
Even the early maloo's did not get the same standard equipment as a clubsport.