Another 8.75 rear question

I picked up an 8.75 axle housing on Saturday. Looking over the dimensions, I'm confused. It has a perch width of approx 44", and a flange width of approx 55". Assuming the truck axles are MUCH wider, is it possible this is a narrowed B Body axle? In theory, I should be able to just relocate the spring perches and bolt it right in, right?

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