Case 1830 UniLoader PCV Orifices Missing & NLA

Hopefully there are some 1830 owners out there who might able to answer an obscure question about some missing parts.
The PCV hose from the rocker cover to the carb is supposed to have an orifice in it. The hose from manifold to carb also has an orifice, but it is a different part # and design. Without the orifices in place the machine won't idle properly.
Neither of these are available from Case or any salvage yards I have checked with. Neither service nor parts manuals have a description...

Case 1830 UniLoader PCV Orifices Missing & NLA

Case 1830 UniLoader PCV Orifices Missing & NLA