Hi Deejay,

All reference numbers on this unit have long since disappeared, however I recall this being a common part for all 3 speed, variable friction drive machines (5127, 5130, 5138, 5144, 5150, 5244, 5250, 5255).
As for pics, none are currently available, however the image shown on https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=14865 is identical to this machine (hope I'm not being rude by 'borrowing' someone elses image).

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IT'S YOUR CHOICE...EVERY TIME!