Has anyone upgraded a single SIM Lumia 530 to dual SIM?

I have Lumia 530, but it came as single SIM model, with plastic inserts where 2nd reader would be, and no circuit board for where the second SIM reader would be. What parts are needed to add the second SIM reader? I've checked lots of sites but no one covers this kind of upgrade, nor even seem to sell replacement boards for reading 2 SIM readers (nor any kind of upgrade module, etc). Just replacement board for single-SIM model.