The only thing ford ever kept track of was how many were released in EACH body style, 4 door or 2 door.
Nothing else.
Ford does not track trim levels or options for most models it releases according to correspondence I had with them when I was discussing other vehicles ford manufactured.
With Fords, the only time you can track rarity is with special models like Saleens, Roush or SVTs (no, there was not an SVT or Roush Explorer), certain models with rabid enthusiast followings, like Mustangs, or something REALLY fancy, like a Ford GT. GM keeps track of all kinds of silly things... and they went bankrupt... Food for thought.
But yeah, if it is a sport... There is nothing rare about it. They didn't have a lot of options anyway, and Ford made a lot of them.