K5 Blazer

My name is Breezy I own a 87 K5 blazer w/ 8 inch lift on 38 Super swampers.. Recently someone stole my drive line and i was hoping someone might help me to find a new drive line or let me know where to measure to get the size of the new drive line.. I was told it is from Falnge to Flange.. But i wanted to double check and make sure that my measurements are correct.. Anything anyone could do to help would be greatly appreciated..

Thanks
Breezy