Majorette 1:59 Die cast
I have Majorette #227 which, although it is not intended to be a feature Mustang, is a yellow Mustang convertible with a black interior. As far as I can tell from research, this model number car was offered from 1988 to 1994 in several different colors and with slight variations. The graphics on the side of the one I have say "Mustang GT" but this could easily be taken for a post-87 LX. There is no GT-style cladding, the front bumper cover has no fog lights and the tail lights are very LX-like.
You can sometimes find this car for sale on ebay. Be careful about buying it online without seeing a picture. As mentioned above, there are other Mustangs out there numbered as #227. One is identical in shape to this but it is painted bright green with a graphic that says "official pace car". Another is a blue Mustang GT with wide wheels.