I have the following: A pair of 501-5239 E450 modules, 400Mhz, 4M cache. One has the cooling shroud. A pair of 501-5237 E250 modules, 400Mhz, 2M cache. One has the cooling shroud. All were removed from working systems. I desire a pair of 501-5129 U60 modules, 360mhz, 4M cache.