Ranger Trailer "backup lights"

I have a 2008 198vx on a single axle Ranger Trailer. I have lost my one of my backup lights again and I cannot seem to find a replacement one. I have removed the light and there are no visible identification marking so finding one is proving to be very difficult. Can anyone tell me what light I need and where I can buy them?

Thanks

check with Ranger, they should have them in stock.
http://xs-s.com/zf/images/smile/emthup.gif