Today’s useless info is that other than common parts like bolts, and a rumor of a shared ring & pinion in the diff, there is really only one single part that is carried over across all of the first three generations of MX-5.
Yup, the side repeater lamp, or AKA front guard indicator.
Theres some variation in whether its clear or amber, but other than that it shares the same mounting, connections and is interchangeable.
Here it is on an NA.
And an NB
And finally, stick them all together….
There we have it, they’re all linked by one single, super useful, little flashy light.