Hi, I was getting ready to do the dual piston rear caliper swap on my 03 silverado 1500 and ran into a problem. One of the new calipers I bought from Napa is threaded different than the other and my stock threads for my banjo bolt. I believe the stock threads are m10 - 1.0 27.5 MM long. The other caliper I think is M10 - 1.5 27.5 long (I can only find a ford banjo bolt to fit that). Not sure why this happened. The obvious fix is to return the one caliper but unfortunately I can't. What should I do?