A packaging machine (10) includes a lane assembly (12) that includes one or more lanes (L) which guide cylindrical articles (B), such as cans or bottles, across a series of substantially parallel conveyors. The lane assembly (12) includes an adjustable guide bar (34) which defines an adjustable portion (V) of the lane (L) that can be adjusted to adapt to the diameter of articles (B). The lane assembly (12) also includes lane extensions (70) that can be adjusted to control the position of rows of articles (B) as the articles (B) exit the lanes (L) onto a conveyor (20).