Kingpins are nominally one inch (24.5mm) diameter. Front brake discs 280mm diameter, rear drums 220mm.
Note that UK type approval document for latest 5 link variant shows this regarding maintenance: 16. ACCESS TO VEHICLE REPAIR AND MAINTENANCE INFORMATION
Section not applicable to cars produced in 'Small Series'
I would expect therefore that generic wear limits would apply during testing especially regarding king pin/bush given the relatively unique sliding axle front suspension i.e. wear may not be detectable with suspension unloaded.
Check out this
thread also PM sent.