76 dart sport drive shaft length

I have a 76 dart sport with a 73 360 LA paired with a 727 torqueflight transmission. My question is I have the stock tranny yoke and im getting a measurement of 47 1/2 inches from center of u-joint to u joint leaving some play for travel could probobably go to 47 tops. is this a common length that I cold find at a scrapyard or do I need to have one made. I see them on ebay but it looks like there measuring the entire drive shaft yoke and all any Idea what that length would be?
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