83 T type EGR valve old GM part number?

[Guest northmn]

I purchased a new EGR valve for my 83 3.8 turbo Riv. from the GM dealership.This part has the new updated part number #19145997.This part comes with a number of different size orifice washers of which one has to use the supplied washer selection chart to find the correct washer .The problem is that the part numbers on the chart are the old GM numbers starting with 170 etc.Does anyone have the old number or can direct me to someone with the old change up numbers?Vintage V parts was no help.