Fender vents difference as I see it.
Body style and type of vehicle aside Fender vents are used in various ways.
1) Fender vents at top and at trailing edge of fender and vented directly into engine bay/bonnet evacuate air always lip or not, however lip @ leading edge of opening is preferred method .
2) Fender vents at trailing edge of fender frt/rear of vehicle and vented directly from wheel well are for reducing pressure in wheel wells and help the cooling of brake components.
3) Fender vent at leading edge of fender and ducted to brakes cools brakes and complements wheel well vent if installed.
4) Fender vent at leading edge of fender ducted into intake or cabin.
Other uses are sure to come into play and not written in stone.
1999 GMC K2500 BURBAN, NAVISTAR enhanced 6.5 td aftercooled, dual alt's, PSC p/s pump w/HD cooler, redundant FSD's, HEATH program, turbine/downpipe wrapped, 4" SS exhaust, real time OBD2 data logging w/device controller, EVANS waterless coolant @ zero (0) psi & 135 gpm pump, 4L80e w/kevlar and premium steel w/cryo treated input/output shafts running @ 100 deg. F & 140 deg F towing, all synthetic fluids, AMSOIL bypass system, MileMarker hydro, dual fuel tanks, and on and on, questions PM me.