Jeesh, I checked on handaaccessories and apparently they're only selling 6th gen and up now... I did a Google search for you also and didn't have much luck.

If it's any consolation I did a 6th gen OEM install and it was pretty straightforward. Perhaps the 4th gen install is similar check these docs:

http://www.handaaccessories.com/acco...oglights4D.pdf

...and compare the parts listed with your kit.