patio door lock

The lever on my patio door lock broke.
I do not know the door manufacturer.

When I tried to remove the internal lock, it fell inside the frame to the bottom!
(I should have looked at your video first!)
Do I need to remove the door & retrieve the lock that fell into the frame???

The opening in the slider part of the door is about 3 1/8" & the holes are about 3 7/8" apart.
The door frame part of the lock measures about 4 1/8" x 1/2" wide.

What replacement part should I buy??
Looking forward to your help!

Here's the handle of the lock that broke/came off.

Many thanks for you reply & help. Yes, the lever looks exactly like mine. Unfortunately I have to report that the slider door could not be removed by lifting it up off the track. It appears that it can only be removed by removing the side frames & top frame & probably also removing the stationary window panel - a major undertaking.

So is it possible to buy a mortise lock based on the opening in the door & the lever? - one that goes with the other part of the lock on the door frame?
How about 82-223? or 82-243?

needless to say I'm a frustrated home owner right now....
Thanks.

I tried sticking a powerful magnet to one of these locks. It stuck like glue. Here's an idea: Try spraying some silicone spray, or WD40 down the channel to slick it up, then stick a magnet to the lock. If you're lucky, the lock will slide up the channel to the opening. This may not work if the channel has a metal support inside, it may not work at all, but worth a shot. I have not tried this, but I plan to. Let me know if it works. It would have to be a strong magnet like the ones in speakers or hard drives.

The magnet is an interesting idea, but in the interim I got a new lock & it is the right size.
I looked at the video again, and I understand how to install the lock, but it does not show how to install the lever part???

So how is the lever installed?

Thanks.

1980s lever lock on sliding door. Note from photo latch connects from upper not lower side. Need replacement.