I wanted to comment on the OP's question. I did re-use the rubber boot. The LED I got had a base that set into the housing and clipped in. Then the bulb goes in and rotates a quarter turn. Before I put the bulb in I re-installed the rubber boot and just kind of pressed it out of the way of being in direct contact with the heat sink on the bank of the LED. After a couple hundred miles of riding nothing has moved and nothing looks like it's melting at all.