I bit the bullet and found one on Ebay UK and paid a ridiculous sum for it.
This is for one of my wife's cars and I am putting an original wheel back on it.
The Mountney that it has now had issues with its horn and shorting out, so I did not want to take a chance.
Nothing like a horn going off in a parking lot on more than one occasion to aggravate someone.
With those dimensions, I may try one of the online printing or emachine shop places.
The picture is nylon spacers and a washer. I thought I could glue/cement them together, but they are 1/2 inch and need to be turned down to the appropriate size. Filing with the spacer in a drill did not work.
I will look at the PEX tubing though for future use.