failed iPad Pro Smart keyboard

I guess my iPad is generation 1 as I purchased it from Apple store several years ago (128 GB, model A1584, s.n. DL****MLN) along with case MK0D2ZM/A and Pro Smart keyboard MJYR2LL/A s.n. DQ****WTL. Everything worked fine for years; then the keyboard went intermittent and finally quit. My question is: what model keyboard do I order for this model iPad?

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