Two items I can use help with

The first is a replacement handle/lock set for my sliding glass doors. We have a home directly on the ocean in Jensen Beach, FL. The salt air really eats up the exterior portion of the chrome finish on our seven sets of sliding glass doors. The image below will illustrate this: In the left image you can see that the exterior portion of the lock is corroded - and this is one of the better ones! The inside portion and the lock itself is in good condition. So my first question is can I get just the exterior portion of these locks? If so I need to order seven of them and will need a price.

If not, please see the right hand image. Do you have a replacement lock for that matches this set? Note that the dimensions must be really close. I can get something similar at local stores but the section shown at the green arrow is not in the right place on those and it will not match up to the latch already in the sliding glass door. So do you have this replacement part (show in the locked position? If so I will need to order three - what is the cost each?

Thanks, let me know if you have questions.