US, but still…bought these last summer for my BJ3. Absolute game changers. Way better than stock wheels. https://a.co/d/05C0uUdv
These were recommended the other day. Of course, they're $30 USD versus $72 AUD from the same source. They are about 25mm larger than the stock ones and come with the necessary flat spanner to get the stud on. I searched "stem casters set of 4 heavy duty".
My wheels had no rubber on them, just the grey plastic. I brushed rust off the metal parts of OEM wheels and sprayed a little penetrating oil on the bolts the day ahead of time. An automotive jack with a Block of wood to lift each corner made it easy to lift the grill piece by piece. Don't lift too much as it does tilt quite a bit and made me nervous on the first wheel. I wedged the other wheels so it didn't roll around. To remove stock wheels, all I needed was a pair of channel lock pliers to twist the wheel casing out and after a few turns, I could do the rest by hand. They came out easily for me with no special tools or wrenches needed. I bought the same wheels everyone has mentioned https://a.co/d/043UYHHd and they are great! I used the included washer as a spacer and snugged with an included wrench. It's about a 30 minute job in total and looks great. Give it a go!
