The heatsinks you have are videocard sinks and they sell around $2-3 on e-bay. In one of the first pics you posted they even had the plastic clips used to fasten them to the pc board. If you bought them as specifically designed for led you probably overpaid. When you run just one the noise is not a big issue, but when you run 12-24 that's a different story. When I played with the VGA heatsinks I used same kind of glass lens that you use and I liked them. I don't want to hijack your thread, but I'll post some pics showing the lens mounting.
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