Stock side skirts are easy to find, since i think they are the same for all models(hatch/sedan/coupe) 96-00 and are going to fit.
I would get a set of those, prep them and body match the color.
They're going to look much more sleek and not trap the dirt those rain gutters are going to trap, then help promote build up of dirt, moisture and rot the car out from the bottom.
I would have saved the time and not had any on at all.
Where have you actually looked and where did you find them for that outrageously stupid price?found some used ones for 150$...