I recommend OEM ballasts but again they are expensive brand new but you can easily find used ones on HID planet or even ebay. THis allows the most absolute cleanest set up but since your car has aftermarket ballast, im not too sure if the previous owner hacked up the harness/connections.
Since the wiring is already set with aftermarket ballasts and since you already bought aftermarket ballasts as well, I would just use those and see how it goes as this point. The aftermarket ballast should have absolutely no problems using a osram bulb.
Hope that helps. Good luck.
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