for ku31s in that size a guy on gumtree fitted mine for $400, my tyres were already stripped. I'm sure there are heaps of 4k flywheels around.
not very often you see XR-4 centres polised same goes with the hoshinos, people seem to prefer the allot centre with polished lip, i think they look gorgeous.
i think you may have contacted me a couple of years ago about a kp61 i found in yangebup that you then purchased haha