I had an inquiry through the website looking for pictures of the Universal L-7. I couldn’t find any mention of this version in Underwood’s book, nor any pictures in my folders. Here is what Wikipedia has:
In 1941 Monocoupe combined with three other companies to form Universal Molded Products Corp. 20 Model 90AFs were bought by the USAAF, who designated them the Universal L-7, for transfer to the Free French Forces. One was lost during delivery.
Here is a picture of a model kit I found on line. I have no data to suggest this rendering would be accurate or not. If you have a picture, send it along and I’ll add it to this post.