I agree that the old refrigerant hoses may not be very reliable with R-134a and may need to be updated with new hose. If you can save the hose ends, a length of generic R-134a compatible refrigerant hose could be cut and clamped to the ends.
The Chrysler TSB # 24-01-95A for converting R-12 systems to R-134a (the right way to do it) would be incredibly expensive to do as it asks to replace many major components.
"Hybrid" refrigerants and oils that claim to be safe with either system may actually damage some components and introduce leaks.
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