https://okcountyrecords.com/
You can search in Major County.
I am not a fan of top leasing as it can cause all sorts of trouble. Just my opinion, but here is an article that explains why. An Overview of Recurring and Related Issues Involving Top Leasing.pdf (210.2 KB)
If you are held by an old lease, then the horizontal well will be under the same terms as the old lease.