Larson has started first five times in 2017 while McMurray is no stranger to the front row at Sonoma.
Edwards has been a hot name for a top-tier ride in 2018. If, of course, he comes back to NASCAR.
Next week's race at Daytona is Junior's last scheduled Cup race at the iconic track.
Bowyer won at Sonoma in 2012 and has eight top-10 finishes in 11 career starts at the California road course.