Very cool idea! We did something similar a decade ago for the Miata's 10th anniversary. http://www.miata.net/misc/socalm/socalm_challenge.html It went over very well and I believe that Tom Matano took the Miata banners to Mazda's HQ in Japan and I think they are still there. So, keep that flag circulating!!!
Im kind of a Mazda hoarder of stuff. Have been for over a decade. By far the coolest, and hardest thing for me to source was one of these flags... Owned it for years, and couldnt even hang it in my last house as there was no wall large enough. When i bought my new house, it was the very first thing up.