Sylvania/Midgage offered these passenger cars in 2 lengths, 67' and 80'. The 67' cars are same length as flyer. MIdgage models held the patent for them. Here's a link to the patent docs -- https://patents.google.com/patent/US2599138. The construction is nearly identical to Gilbert's aluminum cars. I have several of these that I am in process of restoring. I will be away from my computer for a few days but will be happy to post images next week if anyone is interested.
PHM