GK5 brake modifications

I am hoping that someone has already done this. I was enquiring about converting the rear brakes from drum to disc using the GK5 RS kit. These includes the Rotors, Calipers, Pads, Brake Lines, Handbrake Cables

Does anybody know if this requires certification? in the VSI No.6 Light Vehicle Modifications PDF, it says:

Quote:

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BRAKES
Item 16

Fitting of disc or drum brakes that are not a manufacturer’s option for that series.
Example requiring certification:
• Replacement of front-wheel drum brakes with disc brakes on a vehicle not optioned
with front disc brakes by the manufacturer eg fitting disc brakes from a VT model
Commodore to a base model LC Torana originally fitted with drum front brakes.
Example not requiring certification:
• Replacement of front-wheel drum brakes with disc brakes on a vehicle available
from the manufacturer with front disc brakes as an option where all the parts from
that option are fitted eg fitting a base model LC Torana which has drum front brakes
with the disc front brakes originally supplied to the GTR model LC Torana.

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Does this mean that converting to a disc brake using the RS kit do not require certification? However, the GK5 RS is not available in Australia. Let me know what you guys think.

Thanks.