Really the best option would be get the latest copy of an 8710 you can. I believe you can get it from the faa by sending this form to:

FAA Airmen Certification Branch, AFS-760
P.O. Box 25082
Oklahoma City, OK 73125

Hopefully that has most of your hours. If not you’d have to find ways to supplement proof, such as aircraft logbooks, receipts, stuff along those lines that will actually prove you flew those hours.

Good Luck