I am making a list of everything I need to replace when I remove my intake manifold.

So far I have:

Seal rings X8
intake to head gaskets (L&R)
trottle housing gasket X1
*Air intake boot X1

The Air Intake boot says something about modification (maybe a recall?):
Air Intake Boot Below Air Flow Sensor NOTE: Replaces Prior Part numbers. Pre-modification cars will require additional parts.
560SEL M117.968- Note: Also Use (1) 116-141-06-45 Plate (1) 102-094-02-12 Connec


Then I see there is an "airflow sensor flange" which is rather pricey for genuine MB. Needed?

I would like to make sure I have everything on hand that can ONLY get replaced with the intake off. All the rubber hoses above have already been done!

And where can I get the clear "MB" vacuum tubing? I think at least one runs under the intake. The stuff installed is very, very brittle. On the one to the trans is new.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car