How is the quality of Dorman o-rings? I'm going to replace the kit on my oil cooler and my option is to pay $75 and wait several days for a Ford set to be shipped or pay $65 and pick up a Dorman set, tomorrow. I'm not trying to be cheap and don't mind paying the extra but if there isn't any quality difference, I'll just pick up the Dorman set in the morning and get going on the replacement.