I wouldn't order chit from buy fordracing. Call a more reptutable place like summitt or jegs (if they carry the same kit) and have them price match it. I only use buyfordracing for price matches. They seem to f up every order, don't have a customer service line and only deal with you via email. I hate that.
Oh, and the stainless lines are good if they are in your budget.
to the OP: from what i have read the problem is that you wont know if you need fine or coarse until you take the lines off. i guess this is a "parts bin" thing when the car was manufactured and workers just pick what they want out of the bin. so one car could be coarse, then the next 2 could be fine. so that kind of sucks.
if possible i would get both and return the one you dont need.