I see it's on dealer plates. You say "we" so I assume it at least partially belongs to you. How did you get it into the US and legally registered for street use?
I'll have to check the docket to see what the details are regarding importing a Mazda "Miata". According to NHTSA, a 1990-93 Mazda "Miata" is eligible for importation to the US under VSP Eligibility Number 184. "VSP" eligibility numbers are assigned to vehicles that are decided to be eligible under 49 U.S.C. § 30141(a)(1)(A), based on a petition from a manufacturer or registered importer which establishes that a substantially similar U.S.-certified vehicle exists. Usually in this case only minor things like speedometers (kmh to mph) and lights (DOT markings) need to swapped to certify them compliant. Unfortunately, the petition and response (Docket No. 96-81) are not located online and a manual paper search must be conducted to find out the details.
I'm curious which RI submitted the petition to NHTSA (a manufacturer almost never does this since they want to protect their factory authorized distribution network), what else is needed to bring the substantially similar vehicle into compliance, and whether that RI is still in business and willing to import them today. At this point, without reviewing the docket, I would say that only LHD Mazda "Miata" vehicles are eligible for importation since the eligibility list doesn't specifically allow RHD. While there is no specific restriction on importing a right-hand drive vehicle, these may not be imported under eligibility decisions based on the existence of substantially similar U.S.-certified left-hand drive vehicles. At any rate, despite the fact that NHTSA has determined it to be eligible for importation, a Mazda "Miata" may ONLY be imported under bond and by a RI unless it meets one of the other conditions I stipulated above (race car, foreigner, etc.). Also, many eligiblity petitions are only valid for the RI who submitted it. If a different RI wants to import a vehicle, it must independently submit its own petition to NHTSA showing how the vehicle can be brought into compliance with the applicable regulations.