Which needles for hand stitching - Sewing Leather

I’ve read that size 4 and size 5 harness needles are the most common needles to use for saddle stitching. I ordered some CS Osborne # 517-4 and 517-5. Did I get the wrong needles? What should I have gotten?

Leather Needle - Which to Use and When for Great Projects

Realeather® Leather Stitching Needle, 10ct.

The points are purposely dull in order to avoid injury or inadvertently damaging your leathercraft, yet are made far tougher than regular needles in order to withstand the rigours of leathercrafting. Don't get substitutes made for other purposes. These needles are designed purely for leathercrafting.

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