red and blue kingfisher

i have a marine master side mount gear control which is white by colour plastic i need to fine a replacement as the plastic has snapped that you pull out to engage gear on the satellite gear stick it says it is called marine master apparently marine masters went out of production a number of years ago t it has an isolating tab which has to be pulled forward to engage the gear action, or pushed back to disengage? would kindly appreciate some advice gear.docx