Try this web page at the FAA, Good info.
Aircraft Registration Forms [
faa.gov]
Also note the statement at the bottom of the page.....
The Aircraft Registration Application, AC Form 8050-1, is not available for download. You must use an original Aircraft Registration Application, AC Form 8050-1. We don't accept photocopies or computer-generated copies of this form. Aircraft Registration Applications may be obtained from the Aircraft Registration Branch or your local FAA Flight Standards District Office (FSDO). If you use a P.O. Box as a mailing address, you must also provide your street or physical location on the application.Take your white copy registration and turn it over, on the back it will tell you to check the appropriate box and send it in. This gets it out of your name........ you do this, don't trust the buyer to do it. The buyer gets a pink slip with his name and address to fly on for 90 days, he doesn't need your reg. certificate.
AOPA member? if so check their web site for more info.
Charles