It does only have 4 bolt holes on on the WRX I drilled mine, but had spoke with matty before I drilled mine and I think for one in my colour was only £75 for an STI bootlid. But if you're brave enough not difficult to fit. I just made a template up from under the spoiler with a rough idea of where the holes needed to be and drilled the extra holes think I left 2 out of the 12 or whatever it was. I did need to angle grind a bit from inside the boot lid to get the 2 back bolts on.
Here is the final result.