I don't have my owners manuel handy (it's in a box someplace) but i'll try to find it, it might have an address in it.
quick search on the internet had this article, with an address in the lower left column, may be good, may not.
http://marina.fortunecity.com/harbou...0492wap03.html
however if Numrich doesn't have them, I don't think your goign to find them.
Maybe try and find a local machinist who can makeup the poart for you from the schematic for you?