There are 2 types of key with slightly different shaped fins at the pivot point. The white keys are interchangeable so it doesn't matter if the fin is small or longer.
Single replacement key for older Yamaha keyboards or synths
Single replacement key for older Yamaha keyboards or synths - CB Series Keys
EPIGEIST 10pcs Accessories Set for Tuba Water Key Trumpet Finger Ring Valve Caps Replacement Key for Wind Instruments Assembly for Music Instrument Maintenance
Replacement key for Yamaha Clavinova digital piano - VU101 series
USED Replacement key for Korg SP250 Kronos 73 Kronos 88 SV-1
Muramatsu Flute Pad Set - Open Hole - For Older Models