I am going to buy the one from bphobbies (like the one in your link).......
BP sells alot of other heatsinks to...They also have a heatsink that has an inside diameter of 20mm and looks just like that red one(in your link)...it should fit nice around my riverock..item #F914
Sean :)
Hello.... I tryed to check the voltage of the driver...plugged in my mutimeter ...then turned on the RiverRock..what I got made me go o_0 hmm.....It went past 19v and I said to myself "nawwwww"...I put it to my tung and wow..that thing really hurts..but is still lights up the stock LED..Is is...