RepairmanJack did a non-fog conversion to these and did a nice writeup about a year ago, with hard parts needed etc.
To convert from fog type, they bolt in. Electrically, there have to be mods to the wiring. This can be done by cutting/splicing, or by getting adapter plugs.
Relays are a good idea but no one has written that up exactly. I am doing that but have not gotten some bits yet.
Turns have an amber and a clear section with separate bulbs. Some just put the stock holder in the amber section and ignore the clear. Some get another holder, and wire the bulbs separately by cutting/splicing, so the clear goes on with the marker lights and the amber goes on with the blinker.
There is more info on TB, and at Daniel Stern.