Once in HeinOnline, select American Law Institute Library > Restatements & Principles of the Law > Security / Suretyship and Guaranty
Select the series you are interested in. Drafts are located below the Official Text in reverse chronological order.
Jenkins has select drafts in print and on micro 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.