Hi Ray,
For compliance it is a requirement to add the side repeater on the guard, behind the front wheel. I have however seen many cars that have been complied and this has not been done.
If you have to get them, I've seen alot of people use the clear oval VT commodore (or similar) repeater, though I think a squarer one looks better on a R32 being, well, square and all... If you can get away with it, I wouldn't worry too much.