Window Latch Differences and Discounts

A home owner from Missouri says:
I removed one of our broken latches. On the back it has Patent # 5,139,291. Looking at the selections you offer, the 26-419/26-420 latches look almost identical to the 26-243/26-244 latches. Which would be correct for replacing my broken latches.
Also, I need will be replacing the latches on the 15 windows on the south side of the house. Do offer a discount for these in pairs, as I will need 15 each?
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Tom from SWISCO responded:

I'm afraid I can't say for sure what you need. The patent number does not specify. It will ultimately depend on your dimensions. I recommend measuring your latch and referring to the dimensions we show for each product to confirm the best match.

26-243 : Tilt Window Latch, Left Hand
Tilt Window Latch, Left Hand
26-243
$2.73
VIEW >
26-244 : Tilt Window Latch, Right Hand
Tilt Window Latch, Right Hand
26-244
$2.73
VIEW >
26-419 : Tilt Window Latch, Left Hand
Tilt Window Latch, Left Hand
26-419
$2.73
VIEW >
26-420 : Tilt Window Latch, Right Hand
Tilt Window Latch, Right Hand
26-420
$2.73
VIEW >
How to Replace a Window Tilt Latch
How to Replace a Window Tilt Latch
VIDEO
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Anatomy of a tilt window
Anatomy of a tilt window
VIDEO
WATCH >
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How to Replace Damaged Pivot bars
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