Been busy with life but still enjoying the e30. After searching 3 years, I finally found the elusive air intake box snorkel.
Here a picture of the gap where the tube should go:

I sourced one that had a little bit of grime build up and the bellows had two tears. I did the bellow repair with crazy glue and RTV as I found online, and then gave it the SEM treatment. SEM Soap, gray scuff pad and then SEM trim paint. It came out pretty nice.

And here it is installed:
