The first PRC had thick rubber spacers and bolts not snugged. The first was warrantied. The second had the springs and wasn't warrantied. I don't want to knock the quality of the PRC as much as to say that I don't think the alum radiators are strong enough for some applications. I paid around $400 for mine and basically threw it in the trash. The Walker was about $800 back then but had I known the future, I would have bought a brass radiator to begin with. I've had US radiators in other projects and was very happy. I just bought a universal Griffith for a truck project I'm working on but it won't have any stress in mounting on it. Time will tell if I made a good decision on that.