I cant say for sure about the air bag only thing, however my kit will need modifying as it was from a car that had air bags and the clock spring is wrong

I am working through fitting US cruise control to my MX5 at the moment, it seem possible, but it by no means trivial, my spend is approaching $400 and there are still bits that i will have to make, however it will appear stock which is nice, but the wiper stalk and indicaters will end up swapped over