Using the newest part number
is the way to go if you are hell bent on getting a new dispenser and gasket. Earlier part numbers were not converted by sears and they were basically the same dispensers thru the years from the 17 thru the 23. Colors and door locations varried a bit. You should be able to use your old bimetal springs on the new part if they still work.
Dispenser is 9740171 84.14
gasket is 4171447 5.32
Both are priced from and available thru Sears.com/parts
Now that you have the numbers, you can search it out on various sites and vendors.
I have a few used ones if you decide to go that way.
Steve