All industry attendees during Wednesday’s Heavy Duty Manufacturers Association (HDMA) and MacKay & Company Pulse webinar said they anticipate their aftermarket parts sales business to grow this year. Nearly 90 percent predict the market to be up by at least 5 percent, with 15 percent saying they could see their aftermarket business growing by greater than 15 percent by year-end. dealers said their business was already up 8.1 percent year to date; distributors were up 7.2 percent. The company anticipates the aftermarket (Class 6-8 trucks and trailers) will post total sales of $33.3 billion in 2021, up 11.8 percent from last year and $500 million more than 2019.