Yes, that is correct. No Explorers packages were built in '75 or '77. Sport Explorers were started in '72 and they are the only ones that had the bright trim around the windows and stainless vent window frames. The other Explorers didn't have the bright trim. The Explorer dash plaque is an easy add on, so it's possibly been added by a PO. Also, check the build date to see if it is indeed a '75. Any Bronco could be ordered with belt line trim, if that is what you are calling "chrome trim", but the belt line was not standard with any decor group.