How Do I Screen w/ No SSN (Tax ID Only) on Seller Financed House?

[Marvin McTaw]

I have a house I am selling via Owner Financing / Seller Financing. One of the purchasers has a SSN and we've been able to run all the normal background and credit checks. She however will not really be the one making the payments. The other purchaser has a Tax ID but no Social Security number. The vendor I've been using (i.e. TransUnion) says they can't run all the reports I want to run because he doesn't have a valid SSN (just the Tax ID). 

I've collected several months worth of bank statements from both purchasers, a couple of bills (e.g. cable, phone, etc.) and am in the process of calling employers and previous landlords. I've done some research but want to make sure I'm complying with the new laws (since I'm essentially providing a loan). What can I do to make sure I'm complying with all the rules and regulations now required by Dodd-Frank? Should I just get rid of the Owner Financed part and go Lease Purchase instead?