Damper -77 440 cast crank.

A friend of mine is looking for a stock damper for a -77 440 with cast crank.
Anyone of you guys who has a good used or new damper for sale or can give a lead for where to find one?
He gave 440source a call but they couldn’t help him. He also made a phonecall to Damper Dudes without succes.
Any help is greatly appreciated.
Thanks Swedefish