I have purchased a new car, as part of the deal I part exchanged my old one. In order to complete the deal I have been told I need to go to the Immigration office to get proof of my address , so the new owners can legally own the car. My question is what form do I need to download and what if any documents do I need to copy. I intend to go this Mon morning (Chiang Mai) to do this, I just like to be prepaired as best I can to save time.

Any help would be apprciated

Go onto the Chiang Mai forum and do a search on residence certificate. There is a lot of good information on there from earlier this year.