need new DS Electronic pump - What is the part number

greetings

I need to replace the DS electronic pump on my 1998 6.5 turbo diesel engine
how can get the part number of my pump without taking things apart.
I called some dealers with my VIN but they will not tell the part number
(company policy)
How can i get the part number ?

Thanks

Eric

its on the top rear of the ip housing under the optical sensor you can see it with a small mirror it will start ds4831-should be ds4831-5288 or ds4831-5521

Current part# for the pump from GM is 17800077

All pumps with the exception of 1994 HD are the same. Use the latest one to get the most current updates.

I have a 1994 HD in a P30 Motor Home. When the day comes that I have to replace the pump, must I use a '94 HD (which John identifies as an orphan) or can I use a later IP and get all the goodies he talked about?