I'm even more confused now. Do you want the manifold to fit a Genesis 1000 LP? Or do you want a manifold to fit a Gold B? And is the Gold B LP or NG?
The 1000 is a deep box design with 13 flavorizer bars. The Gold B is a shallow box design with only has 5 flavorizer bars.
The 1000 manifold has a part number of 56038.
The Gold B manifold has a part number of 90373.
Hopefully, someone can chime in and let you know if they are compatible.
That NT number in your first post is not a part number but a SKU number. There is one for sale on ebay right now with a starting bid of $12 or best offer.
https://www.ebay.com/itm/Weber-3-Burner-manifold-For-Gas-Grill/333506120906?hash=item4da6838cca:g:zx0AAOSw5T9eOyJU
But I have no idea what part number that is or if it will fit either of the grills you listed.