Thanks. I looked closely at this option, but decided to go with the 6.00x6 wheels and tires.
Sky Designs, Beringer, Anderson Aviation (Beringer's Australian dealer), and TS Flightlines have all been very helpful, and I've now found out what I need and placed my orders for the landing gear and the brakes, wheels and tires, including the 6.00x6 option.
TS Flightlines are still doing some beta testing on another RV-8 installation, but when that is complete I expect to be able to place an order with them for the brake lines, so all looking good.