Left and right crank mechanism

A handy person from Massachusetts says:
We have a left and right entry gard truth crank mechanisms. Part no. 4.840.075. There's also another number near the gear, 31782L. If you flip the mechanism there are two additional numbers on the back of the pivot arm; 31368 and well as 20810.
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Casey from SWISCO responded:

Hello, thanks for posting! Take a look at our 39-035 and 39-036. Compare their dimensions to yours to be sure its a match!

A handy person from Massachusetts says:
Thats an exact match!! And upon reviewing the additional accessories we would also need 39-560 & 39-561.
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