As you've probably learned, there are two things at play here. First, your dealer has to get an allocation for a diesel. Those are at 10% for the remainder of the 2023 model year. If your dealer is on the smaller side, that could be a very long wait. No one really knows how GM decides which dealers get the diesel allocation, but more than likely, a larger dealer is going to have a better chance than a smaller dealer. Then the next thing you have to worry about is other constraints. Are you looking for an SLT or Denali? The SLT luxury package, Max tow and stand-alone Adaptive Cruise (for Denali) have been on constraint for months. There may be other constraints on your order as well. What exactly does your build look like? Yes it is frustrating but there are a lot of helpful people on this forum who are often more help than your dealer.