Does anyone know the manufacture or have a part # for the rear power nav light

Please contact Innovative Lighting, they can help you out. Marine LED Lights & Accessories - Innovative Lighting
The part # for the light was 506-1200 and the part # for the replacement lens was 504-9915-1. Not sure if these are still available since they discontinued that light many years ago.

Thanks, I found the lens through a google search and the replacement l.e.d.s.