Unfortunately, this is one of those engines where not a lot of detail parts are listed. You might need to be on the search for an entire shell or just live with some things missing.
Example, the missing popoff valve- Doing a search for pop (sometimes better to use part of a word) and then refine the list with railking.
On the bell, they have it in grey, not green, and further it's brass, not nickel to match everything else.
Nearest matches i could find using stanchion, railking
or
Again, the problem is that looking up this engine, the mechanical parts listing does not exist yet, and worse, in parts in inventory, even knowing keyword searches- the parts- even if not in a list just are not there from what I can see.