Bill, I asked a very knowledgeable friend about this. He has about every NYC steam engine made including Pullmor Hudsons and Mohawks as well MTH steam. He said the Pullmor hudson eccentric won't work but one from the MTH Premier NYC Niagara fits perfectly. The MTH Hudson eccentric is close and would likely work if the Niagara crank is NLA but MTH reissued the Niagara just a few years ago so you should be able to get them.
Apparently Mike Wolf was involved with the design of the Lionel Mohawk and carried some of those design elements into his products.
Pete