Have a 50’s era case 400 series row crop. Does any org sponsor refitting tractors with ROPS?
Several states have rebate programs for retro-fitting ROPS on older tractors.

Some companies do build ROPS for older tractors, but they must be certified the same as factory original equipment, so expect these only to be available for the most common tractors:

It might be cheaper to just buy a tractor that already has a ROPS.

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