I have a GFCI part I need to replace but it may now be obsolete. It was located in a 120 volt shower recessed light fixture. The GFI device is cylindrical, 3/4" in diameter, 2.5" long with cooling holes on one side. It plugs into the junction box knock-out of the recessed light fixture where it's wired into the light circuit. The leads are black, white and blue in color. I think this was installed around 1989 when the house was built. Can anyone tell me if these devices are still available and what their designation is. Thanks.