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I’m not home but if you can wait a little, I can get you the stock number mine use. I believe we have the exact same parts. It was a Goodyear part. What makes it harder to find is the 3/4” hole that Newell uses for the air cushioning.

 
The link I provided shows a bag with a 1" npt threaded hole in the top offset to one side. 

Here is the Goodyear number that crosses from the Firestone W01-358-9447 is Goodyear 1R11-066 and they are little less money:
https://www.sdtrucksprings.com/index.php...s_id=16532