It all boils down to what you think the root cause is. If you think its a bearing load issue then a roller w/additional thrust face, carbide ball or double row ball will improve the life over a single row. Obviously that is not the sole problem otherwise all IMS bearings would fail. If its a lubrication issue(failed grease seal) then bearings open on one side might work. If you think its a runout/vibration issue then they are all temporary fixes if your engine has that defect. Perhaps a plain bearing with DOF will be more tolerant.
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'58 356A coupe, just a driver
'00 Boxster S fair weather - daily driver
'11 Jeep Grand Cherokee Limited - winter daily driver
'92 F250 - junk hauler; previous Porsches '95 993;'08 Cayman S;'70 911E
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