Take a look at my web site:
https://www.scottdoudrick.com/body/ On page 67 it shows 2 cowl vent assemblies, both with 91C part numbers. I guess we know what the two look like now. I wonder why they did them differently. Also interesting that they are not 81C numbers - these were 1 year only assemblies. The parts specific to the express are on the last page in case you are interested.