The 27-year-old Bell from Norman, Oklahoma, capitalized on a late strategic call for fresh tires followed by two late-race restarts and a series of carnages to punch his ticket into the Round of 8.
The 40-year-old Allmendinger from Los Gatos, California, led a race-high 25 of 72 over-scheduled laps and prevailed through two overtime attempts to claim his fourth consecutive Xfinity victory at the Roval.
The National Motorsports Appeals Panel amended the points penalty issue to Byron while increasing the fine amid his on-track incident with Denny Hamlin at the Lone Star state in September.
The Los Gatos, California, native became the winningest Xfinity Series competitor on road courses by winning the Playoff's Round of 8 finale at the Roval.
The Dawsonville, Georgia, native survived a slick, cloudy afternoon of racing by winning at the Charlotte Roval and securing a spot in the Round of 8 in the 2020 NASCAR Cup Series Playoffs.
The 2016 Xfinity Series champion from Monterrey, Mexico, is set to reach a milestone start in his sixth full-time season within NASCAR's three major division series.
The reigning three-time Daytona 500 champion was awarded the top starting spot for this weekend's Playoff event at the Charlotte Roval following last weekend's victory at Talladega.