there as another thread on this, the e62 uses a new like "media port" or something different. Supposedly the new music stand speaker things come with the proper adapter. others have reported success using a treo 700 something stereo headset. I tried to make one and figured out the resistance to get the phone to accept my homemade cable but no matter where i attach the speaks i don't get stereo sound, i think i need some of the one was current things i can't remember the name at the moment. there is a nokia stereo headset out there for it, i think lets talk had it.
if you want the easy way, get the radio shack 2.5 to 3.5mm adapter, i know it doesn't "work" by itself that is. what you need to do is plug in the headset that came with the phone, then you have to be quick unplug that headset and plug in the radio shack adapter before the phone realizes you did anything and boom true stereo sound.
that is my workaround for the time being.
it works have done it many times, you just have to carry around the old headset with you, lol.