I'm not sure I understand what you mean about pushing the light back into the housing.
Ok so I will cover all the basis here since I'm not fully understanding the question.
First of all, the connector you have pictures no longer goes back into the housing (obviously since you now have the LED in there, but just wanted to be sure we are on the same page).
That connector and the VLED 3157 adapter has to be relocated under the tail lamp housing since there is not enough room for it to stay in the area behind the housing. What I did was wrap a layer or two of electrical tape around that connection (where the stock bulb used to go and now has the VLED 3157 adapter in it). This is just to ensure it stays connector and remains mostly water tight. I then wrapped that entire piece with some foam padding so that when its stuff behind the back bumper under the tail light housing it can't flop around. Now, before you do all this the resistor has to be mounted in that area on the flat painted surface of the body. You will see it when you look down in there. Use double sided tape and secure it to that flat area. Once that's done you can stuff that connector down there as well. To get better access get a torx bit and remove that single bolt from the bumper and you can peel the bumper back a little bit more to get your hand in there. Hopefully this makes sense as all I can do is describe it without pics. I'm at work right now and can't take pictures, plus I don't necessarily want to remove a tail light again lol.
So to summarize...
-install set screws as shown on the first page of this thread. I believe you will use 3 of them for this application. Then securely install new LED into tail light using the correct thickness gasket to achieve it a tight fit.
-mount the square control box in same location as pictured on first page. Use a good double sided tape or hot glue gun.
-install VLED 3157 adapter into the original socket where the stock bulb goes. Wrap some layers of electrical tape to secure and seal that connection. Then wrap that entire thing in a foam padding (or whatever you have that works the same). This is to give it padding since it will technically be dangling between the back bumper and body of the car.
-Put a layer of double sided tape on the resistor and secure it to the flat punted surface behind the bumper under the tail light housing
-Jam the original bulb holder and connector (that you wrapped in electrical tape and padding before) into that same area behind the bumper.
-Put all the connectors together and reinstall the tail light housing.
Hope this helps.
---------- Post added at 07:56 PM ---------- Previous post was at 07:52 PM ----------
Originally Posted by SCKansasWK2
Did you just measure from the stock assembly gasket to the bulb and then adjust the V3 accordingly?
Yeah more or less. I didn't even measure. With the stock bulb in its original holder I held it next to the VLED bulb and set the length of the VLED bulb so that both gaskets were equal and I rotated the lens of the VLED bulb to where the filament is on the stock bulb...make sense?