I cannot remember as its been some years back but i think it was the curtis handsets. There is an additional link that can be put soldered in which then makes the handset universal and work on several different types of trucks that use the curtis system without any resttrictions...but I cannot remember if it was the curtis handset or not as it was some time back. Perhaps someone may of heard of this or know about it?
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.