Aftermarket shoulder belts for 68 barracuda convertible

Anyone out there have a good solution to get shoulder harnesses in a 68 barracuda convertible? Had a close call a while back when someone pulled out in front of me. It’s got me jumpy.
Call Gary from Winkle he has a 68 Cuda ragtop in his yard. 601-721-6654. Please tell him Al from NY referred you.