GE Monogram refrigerator part

We have a GE Monogram refrigerator that has developed a small water leak. The water line connects to the ice maker on the back via a small plastic piece. This plastic piece is where the leak is located. The model for the refrigerator is ZISS420DCM, and ours was built in 2002. The refrigerator works fine and we don’t want to replace it, but that specific plastic piece is no longer in production and every place that would normally carry it is out of stock. This only affects the ice maker, but for us, that’s kind of a big deal. Any suggestions on how to work around this problem would be greatly appreciated. TIA