As I don't want to claim something absolutely accurate, here's the information I have:
Both versions of the spare tire have the same bolt pattern and very close to the same outer tire diameter. Additionally, at various times during my ownership of my Roadster, I've mounted both the 17" steel wheel spare and the 18" aluminum wheel spare on my car to check fitment.
To my knowledge, the coupe and roadster versions that came equipped with 19" wheels and a spare tire were equipped with the 18" Enkei aluminum spare.
Given you have 19" wheels and the above information, I think it would fit.
YMMV
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