The Kolpin chainsaw press is pretty adjustable for the angle that the saw sits so I think you would be able to manage a 20 or 24. The negative is that you need to be a little creativity to mount it. It is generic. In the end I mounted it on my spare tire carrier which keeps it well inside the bed and protects it from getting hit.I was going to order the chainsaw mount for my Viking but it says it only holds a 18" bar on it. The picture just looks as its a open sleave for the bar. Does anyone have the chainsaw holder and if so could a 20 or 24" bar fit in there?