I used these amazon link and put em in my GEN-1. I went with a fanless heatsink because I've heard that the life span can be advertised at 50k+ hours yet the fans will die before that leading to a loud whine. I did not alter the rubber boot at all and so far I've had em since September and I...
this is what I put on my GEN1, they are "Plug and play", look legit, and increase visibility tenfold.
https://www.amazon.com/gp/product/B00L8FMM8Y/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1