Searching for pella sliding door handlesa

Please see the images -
I recently purchased a Pella sliding door, 8'-0"W x 6'-8"H.
The door is approximately 2" thick.
The door did not come with any handles.
There are (4) pre-drilled holes, one hole second from the top, is for the lock.
The three larger holes, 1/2" diameter, align top to bottom.
These holes are 2" from the edge of the door.
The top hole and the third hole down are 8" apart, on center.
No idea what the bottom hole is for.

My question is to you sell handles/key operation for this door?
The door is black and I would prefer black hardware or silver.