You probably already looked, but isnt the wheel branded with the series number on the back? Usually with the offset and the made in USA stamp or whatever...Just a thought. I've been trying to find them myself but nothing with the 5 spoke design like yours...
The backs of the wheels are really rough hard to read anything was trying to find the offset but no luck either the wheels look like doodoo when I got them I know the offset is not as crazy as the weld 15x10 I had b4 these