Baldwin-Lima-Hamilton is the actual manufacturer you refer to. They were absorbed into Clark Machinery in the 1960's and largely disappeared from that point on.
Clark no longer exists as a construction and mining machinery manufacturer, having been bought by Volvo and Ingersoll Rand.
You might ask at a Volvo dealer if they carry or have access to parts for the loader, I seriously doubt IR would.
Calling or emailing the parts house CM1995 detailed above might bring results.
Your best bet might be to have a good machine shop either rebuild the part you need, or maybe construct an entirely new piece.
Good Luck!