Both 1156 bulbs, I happened to have my A-spec tails easily accessible so I just checked. If you have Amber tail lights with BAU15S housing in the signals, could they be from an early JDM car? Several of the 1156 LEDs I've come across use the BA15S/BAU15S designation to specify base type while still calling it a 1156 bulb, such as the below pic. I'm not exactly sure how the 7507 number relates, maybe that is the receptacle for the bulb, where BA15S/BAU15S is for the bulb itself.