I've got some basic questions on the 14B. What trucks (year, size) had them? What's the difference between the 14FF and 14SF? How can you tell them apart?? Is relocating the perches needed to fit a 75 K5? What about at dually 14B? I really appreciate the help. My Blazer is getting closer to rolling and I know I'll want to upgrade in the future. I just have no clue what I'm looking at regarding the 1 ton suspensions. Thanks again. It's not what you buy, it's what you build!