I have a quick freewheel question so i though i would drop it here. Working on a vintage MTB build and need to complete the drivetrain with a new freewheel.

I'm upgrading the front thumbshifter and the rear derailleur to the Shimano Deore MT60 series. Single chainring on the front, no FD. Looking for a Shimano index compatible 6-speed freewheel and would love a recommendation. Gearing is not that important as the build is more of a cool grocery getter.

How do i know which vintage 6-speed freewheels are index compatible?

Thanks for your time.