IIRC there are several different groups of transmitters based on frequency (

) used and or code sequence. Something about the fine print FCC ID molded in the back of the case, a number sequence must be within the same range.
I know my wife's 2000 Civic won't work with my 02 Insight and their physically identical.
Google is your friend, there are a few online discount retailers that can provide one at an eBay competative price.
HTH!