I have a 1990 RX-7 convertible, 5-speed manual. Having trouble locating a cold air intake for this model. Any suggestions?

 

I don't think anyone ever made a real 'cold air' intake for the FC. I have seen various people (particularly SCCA road racers) make their own using an open element K&N filter and then 'boxing' in that area where the filter resides so that its not sucking in hot air from underhood. I think you can remove the flash to pass lens in the bumper to feed some cold air to that area.

its been a long time since I had my FC turbo 'vert but IIRC, that is how I had mine setup.