Your best bet will be search the bone yards (Salvage Yards) that box is somewhere around 30 years old and i'm sure it was used for a number of years on other GM Products. If you have it off the rig and in your hands, look for a 6 ro 8 digit number and call your local GM dealer and ask the parts dept to see if its still a good number and what other rigs it came on. Take your list and hit the bone yards. Best i can do for ya Sir!
Doug & Darlene Morgan RVM96 & Abby Gabby(pooch)
04 Dolphin 6375 LX W-24 Chassis #434136
"The Journey is our Destination"Hickory,NC