Yep, same system on my truck. I've attached the part numbers. Buying replacements will be expensive. Might be better to properly blank off the inlet ports. But you appear to have all sorts of uh...interesting...things going on with the air injection and PCV systems. As others have said, you have a bit of a mess going on there.
Anyone who has one of these old 110's and still has the original engine and equipment fitted really needs the parts manual.
And here's the workshop manual for the older trucks:
I'm sure there are versions available for download on the net, but I prefer actual books.
Hope this helps!