OK im really getting seious about my swap now and gathering parts everyday now. (doing a SFA in my '99 NBS) I was going to use 47'' because I though it would be easy enough and I really wanted to use 4" BDS springs, but ANYWAYS 52's are going to make the swap easier due to frame design. My question is do yall make your mounts 52" apart when you do the swap in the front? I they are 52" apart in the rear but when I took them out of my donor truck with no load there only about 50" long. Also will they be decently soft? Last question do these have about the same arch to give me the equilvlent of a 4" 47" spring?