Paul from SWISCO responded:
September 23, 2016
Hello! The number you show us is just for the operator housing. It's not often used for identification. Manufacturers change stamps and markings all the time, so it's more reliable to go off of the whole part itself, and its measurements. The 39-171 and 39-172 operators have a 5" arm. Since that was too long, look at our 39-317 and 39-318 instead, or maybe our 39-387 and 39-388. These have different lengths. You will need to measure yours carefully to confirm.
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