[EricH]

I would also attempt to find the model number and a spec sheet. Model number would likely be found on the device itself (if it survived the whole "being removed from the vehicle" routine) or in an owner's manual or repair guide (if you could find one that listed the parts). Once you have a model number, a bit of Google and you should have a spec sheet. I have yet to see an inspector debate a spec sheet that matched up to the component, unless the spec sheet showed the component was actually illegal.