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Recent discussion on another thread was about putting speakers in kick panels, where the air vents are. There are differences between the '69 and '70 models worth noting, if you are going to modify your kick panel vents. So, you ask why is there a little vent in the door lock pillar on the 1970's, but not on the 1969's...? For the Mustangs, several things happened....the first was that the vent windows previously used on the 1966-1968 Mustangs were eliminated. Second, on the fastbacks, there are no air extractors. So, with the windows rolled up in the 1969's...not much air moving around. So, if you were smoking say a pipe.....the passenger compartment would look like the "Up in Smoke" movie scene in no time... Ford engineers to the rescue....they invent "Direct Aire" This is a flow through ventilation system. It uses the cowl vents, and a space under the rear seat to allow air to flow into the car, under the seat, through the trunk, and out the one way door lock pillar vents.... Huh? Really? See page 6 of the attached document. (GM had already figured this out and offered the same kind of thing in the Camaro's) So, if you eliminate your kick panel vents in your Mustang, you may have a little less air movement in the car. Unless you have factory A/C, then that handles the issue nicely. ShopTips8-1.pdf