Looking for a key locking handle for this door

Hello,

It looks like you could use our 82-310 key lock in your current outdoor handle if your indoor thumb lever is positioned in the center of your handle. If it is positioned toward the top or bottom of your handle, you'll need our 82-044 handle and 82-315 key lock to make sure that everything matches up within your mortise lock. 

I'm not sure if your mortise lock is broken, but if it is you can replace it with our 82-218 mortise. Only replace it if your current mortise lock is damaged. Thank you!