It might be worth contacting Kawai directly for the key, I even managed to get parts for a Kawai SX240 some years ago.
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Antoine Deschênes2017-08-22 16:21 GMT-04:00 brujerman@... [k5synth] <k5synth@yahoogroups.com>:
I would gladly give you a key, but I really don't have time or the space for the K5 or K5m, so I would prefer someone to pick up the K5 as a complete unit.The K5 other than one side piece is actually in pretty good shape.