I sold a home to my tenants on a two year contract and I need to find a 1098 form to fill out and send to the tenants to file with there taxes. Where do I find this form?

As an individual taxpayer, you are not required to send a form 1098 to your acquirer. If he paid interest to you, he can still claim seller-financed interest as mortgage interest. And you would need to report that interest as income on your tax return.

Here are the instructions for Form 1098 for your information - See the chapter Who Must File?

https://www.irs.gov/instructions/i1098#idm140711846985216