Mine came as an email. It had an ID number, and using that on their online form fills in much of the info. Basically I just needed the serial number and then check the appropriate box and submit.
Already thinking about what we'll put the $7 check towards. I think this also increases the warranty period which is probably the bigger gain.
"I might be movin' to Montana soon..."
2013 Eagle 29.5RKS
2013 Ford 6.7L diesel F350