Just a FYI, if your looking for a simple little Saturday/sunday project while your waiting for snow to come these footwell vents are very easy to make. It takes about $2.00 in material and maybe an hour or two to make. Take a few measurements, make a pattern out of poster board, its simple to cut with scissors, and is easy to work with and trim it until it fits. Once you have the pattern trace it onto some plastic sheet and cut it out with tin snips. Any kind of race shop sells rolls of plastic sheet in about any color you want and its like 2.00ish a foot off a 22-24" wide roll. drill holes for your venting or cut out the slots and attach pet proof screen to the back side with 3M spray glue.
Eric