I think you are too involved in semantics. This is not a kit. Both aluminum pieces are part of the Blade holder/LED module. The only reason they are separate in the picture is to illustrate what is involved in adding the actual LED. Even if you already have a heatsink, just buy the whole blade holder. So what if you end up with an extra heatsink, because if you stay in this hobby, you just may need it later anyways. Believe me when I tell you making one will not be easy for you if you have to ask how.
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