You’d have to get very lucky with someone having old stock to turn up a side chute. Occasionally they come up with online sellers but they’re often very expensive.
They’re not difficult to fabricate if you’re prepared to put in the time and elbow grease. I made a workable substitute for one of mine (an earlier model) by copying an original. I traced the original onto card to make a template and then transferred the template outline to sheet metal before bending, folding and welding to get the right shape. It’s not identical but with a coat of paint it would take an officionado to notice.
