The Fiat style joint for the 1100-2300 listed in Ebay UK item #115683332101 that Lee posted looks perhaps to be the best candidate yet????
I would ping the seller to get the dimension/diameter of that lower casting piece that fits into the Goose a-arm........run to the bank from there.....if need be????
There were some other candidates.....many listed as lower for other cars.....that looked interesting. Again, I was looking only at the "one piece" castings and not the stamped multi layer steel versions.......
Steve