I'm looking for a clutch. Done some searches and most say that the clutch is 10.5. Most places I've looked at show a 10.4 or 10.5. Is there any physical difference or are they one in the same? Bought the car with the Tremec already in there but I'm pretty sure it's a 26 spline. I was looking at this one but I don't want to waste money one the wrong one.