Need help, Speedway Black Shadow air cleaner

[pdlsa10]

I am restoring my 1971 Speedway Black Shadow. The only other 1971 Black Shadow that I know of is the Minibike magazine test bike, so I do not have any other references. The problem I am having is locating the original type air cleaner. Any help on what air cleaner was used on this bike or another reference picture would be appreciated. I attached a picture of the air cleaner.

 

[pdlsa10]

Here is a picture of the bike with the engine removed

 

[pdlsa10]

I think it might be a modified stock Sachs 80b air cleaner. There is another part in front of the air cleaner that I am unsure of as well. All the parts for this bike are unique for 71 Black Shadow only, engine mount, TC mount, exhaust holder and carb with the thumb choke. I have all of the rest of the parts minus the air cleaner. Any help would be appreciated.