Thanks all for the help and the advice. Like the Co pilot shelf but the price...
The H3 you show is what I've got in h7. Just deciding whether to put all in the housing or drill a home behind the bulb in the cover and have the heat dissipators vibe through the hole.
It was a tight fit but I managed to get the back cover on after stuffing all the parts inside. I put together a composite picture with some notes on what I discovered attempting to retrofit the LT combined LB/HB headlight to a LED HB bulb.
A. is the total length minus the emitter rod that needs to fit in and to the top of the metal bulb holder. It is too short requiring the bulb holder to have just a little cut off at the red line to allow the bulb to fit all the way in and key into (E) to keep the bulb from rotating.
B. is the length of the metal portion of the heat sink and I found the form factor on the left to be too long. the bulb on the right has length (B) and was usable. Only way I currently have is a visual comparison to pictures, one with the channel cut and extending beyond and the other. Most bulbs do not give the dimensions but length (C) is important to not be too long if you want to have something to hold all this in the reflector.
F. is the diameter of the emitter rod. This is important because the HB hole in the reflector is square with notches for tabs (D) to fit into. Bulbs like the ones in the bottom right are far too large around to fit through the hole in the reflector and you DO NOT want to mess with the reflector itself or no bulb will ever fit properly.
Summary. Find a bulb like the one on the right. They seem to hit in lots of some quantity and then disappear never to be seen again but a similar usually brighter bulb in the same form factor will show up some time later.
Carefully cut 1/16 to 1/8 of an inch off the bottom of the metal part called the bulb socket and fit the LED bulb all the way in so the notch fits properly into tab (E). Use some strips of aluminum duct tape to secure the bulb and the socket together. Not too much as it still has to fit into the hole in the headlight. I used enough wraps to make it not wobble but still slide easily. Save the plastic piece that went on the end of the bulb socket should you ever want to go back to a standard bulb. Insert the bulb and socket assembly into the reflector aligning the tabs (D) properly into the reflector. If it works like mine did, the copper clip will fit loosely under the assembly where you can then secure it with a zip tie around the copper bands and it will be very solid. Hook up the wires and test. If you are lucky, all will fit under the cover with no holes but mine was very tight.
Good luck and I hope this illustration of what I learned on this effort helps you and any others looking to improve the poor LT lights. Just a note, there is no CAN bus on the LT so no worries about bus errors and lights not working properly.