HeinOnline's American Law Institute Library has the most comprehensive collection of drafts for the Restatements of the Law. Members must be logged in to jenkinslaw.org to access this database. HeinOnline is also available in the library.
Restatement, Third, Suretyship and Guaranty (1991-present)
Restatement of the Law, Security (1936-present)
Jenkins has select drafts in print and on microfiche in the library. Search the Jenkins' catalog for Restatement* Draft* Security for the full list of Security drafts and Restatement* Draft* Suretyship* for the full list of Suretyship drafts.