I did my homework. Here are the Sony original parts:
97076 The remote and the receiver, best here:http://www.jr.com/JRProductPage.proc...feed.PS2+97076
SCPH-10150 The remote control itself without the IR receiver
SCPH-10160 The IR receiver
AVOID the SCPH-10420 Sony PS2 remotes at EB, Walmart, and Kmart, these do not include the receiver.
I already have the RS adapter.
I kindly suggest you modify your original post to reflect this, otherwise a lot of folks will end up holding the remote in one hand and the PS2 USB adapter in the other hand wondering what to do.
The source of this confusion is that after 2003 PS2s started sporting an IR input, eliminating the need for the receiver.