[tonythetarga]

The only way to know for sure which bearing you have is to open the hatch and inspect it. What you do from there if it is the larger bearing is up to you. There are pros and cons for each. The failure rate is quite low but they do fail occasionally. One solution is to just drive the car, get the revs above 3K when driving and change the oil frequently. That means at least once a year (or every 2500-3000) for a car driven occasionally. If you plan to track the car, you should change the oil a bit more frequently. Also put in the X51 oil baffle (or the one from EBS racing) to prevent oil starvation while tracking the car. Use good oil. Don't store the car with dirty oil, put it away with fresh.
My '06 Cayman has the large bearing with the seal on and 95K on the odo. Oil analysis shows normal ranges of all items checked.