This was posted at sr20forum by Swiss.
The original remote # is KOBUTA2T, however...
KOBUTA3T will also work, but you MUST get the one with a panic button. There is another style KOBUTA3T that has a trunk release, it WILL NOT work.
The A3T's are a lot more common and easier to find. I have two- one for my '96 200sx SER, one for the '98 Sentra SE. Works fine for both, I got them both on ebay for ~$30.
Just DO NOT GET ONE WITH A TRUNK RELEASE and you'll be set.
I got the one he said to get, which is KOBUTA3T with no trunk release.
Just do a search on ebay, I bought mine from some seller named oldbay123.