Haha, here's no way I'm gonna remove the one next to the TRS socket unless I absolutely have to. I had to remove the spacers and shorten the pins, then stuff it under the cables.
Alternatively I could have gotten Browndog adapters, but I'm not gonna pay 12$ shipping for something that costs 6$ total and weighs close to nothing, lets not mention that it's the slowest possible shipping method.
I found these on ebay from a greek guy, which means fast shipping within the EU (arrived in about a week). I also ordered rounded pins, but I couldn't have shortened those like these ones as they have those thicker parts which are pretty much mandatory spacers. Something to keep in mind if your O2 is as crowded as mine. The OPAs came directly from TI. Packaging was total overkill XD
As for the sound, don't expect much improvement over the 4556s, but it's noticeable.