Change out pull handles and install keyed lock

A quick learner from NJ says:
June 1, 2020
I want to change out the pull handles with new ones with a keyed lock. The current one does not have a keyed lock and I never done this before. Which one will I need?
The distance between the screws is 4 inches.Any help or suggestions greatly appreciated. I would like to order ASAP
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Tom from SWISCO responded:
June 4, 2020

Hello! If you just wanted to add a key lock to your existing handle set, then you can use our 82-315. The video at the end of this post will show you how this works.

If you just wanted an overall update, then our 82-086 Legacy lockset will be compatible with your door and mortise.

Please let me know if you had any questions. Here's that video:
Key Lock And Housing
Key Lock And Housing
82-315
$15.97
Legacy Keyed Handle Set, 3-15/16" (1-1/8" to 2-1/2")
Legacy Keyed Handle Set, 3-15/16" (1-1/8" to 2-1/2")
82-086
$49.70
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