All 89-97 NAs left the factory with the rear-deck hardtop 'Frankenstein' bolts regardless of whether a hardtop was ordered, but a car that never had one lacks the B-pillar side posts/catches; the factory body-color hardtop itself is repeatedly valued at $2,000+.
Factory hardtop value and 'Frankenstein' mounting bolts
Mazda MX-5 Miata (NA) · originality