Need to find Water proof box to protect electronic equipment

[lts70]

I want to find a water tight box that will fit over a 4-3/4” long x 3-5/8” wide x 2-2/4” Tall converter I want to protect. This would be placed in my engine bay by the driver side firewall fender area to give you an idea of the amount of exposer it will have to the elements. It is actually a speedometer converter to run my mechanical speedo off of my newer style trany. I will post a picture of the unit I want to protect ( not rated for weather exposure).