Just bring in what you have. Right now with corona virus it is impossible to get to the regular DMV but for something like this I prefer a 3rd party DMV like what we have all over tucson. They are a little more loose on their requirements of things or are at least more willing to work with you on something and get it figured out. I have a couple bikes I will be "buying" from my wife with a bill of sale I made up. And make the bill of sale for like $100 to keep the cost of registration low.