Yeah they are hard to find here in the south, thats not eat up with cancer.the south has alot of humidity in the air . not a good thing if not kept up. By the way welcome to the club . lots of info. in here, and pretty good people too.,alway's glad to help!
Dude here in the southern U.S. you see lots of old american iron drivin the roads , cause we don't have the stiff emission tests that most of you have. but I don't see alot of old imports . untill you drive alot of the back roads and find em in peoples back yard with weeds growing around them .
They do make very small aftermarket polly tanks that are not expensive at all. I used to run an 8 gallon tank on my racer. Came with brackets to mount in the trunk space.
The sentra came into production in 1982, was not much to it at first ,but sold alot of them. then they got very popular and are still in production today,and very sporty now. Like the sentra SE-R
If your talking about up to 85 in the U.S. it might be a close race between the Z, 210,& sentra. Not everybody could afford to buy the Z- car so I guessing it would be between the 210, and the sentra.