lock and keeper

A home owner from Michigan says:
Do you sell the lock and keeper for this window. What company actually manufactured this window? The manufacturer code is ELL-1. I'm assuming the 1 means single hung.
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Tom from SWISCO responded:

Hello! The sticker tells me that this window was made by Atrium, but I don't know what the lock and keeper would be. In order to determine, that I need to see pictures of them. I also need you to measure the distance between the two installation holes, center-to-center, and tell me what you get for each part.

A home owner from Michigan says:
The distance between the installation holes on the keeper is 2 1/16 inches. The distance between the holes for the lock is 1 7/8 inches.

The keeper is only about a quarter of an inch wide and its overall length is 2 5/8 inches. The overall length of the base of the lock is also about 2 5/8 inches. The radius of the semicircle on top of the lock is about 1 1/8 inches. The screws for each are 3/4 inches long. The screws for the lock are wider than the screws for the keeper.

I really only need the lock because the keeper is fine. I'm assuming it's best to purchase both together to make sure they match up.
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Tom from SWISCO responded:

Thank you! Based on your dimensions, I believe our 90-316 Pella brand lock may be your best bet. We also sell the 90-286 lock, which matches the given dimensions, but like you surmised I cannot guarantee that it will work with your existing keeper. Then again, it very well may. It's up to you if you want to go with just the lock.

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