39-172 vs 39-316?

A home owner from virginia says:
looking to replace stripped operator. swing arm says truth 31850. looking on website both 39-172 and 39-316 look the same.whats the difference?
User submitted a photo of a window operator.
Profile picture of Paul
Paul from SWISCO responded:
The difference between these two operators is the link arm. The 39-172 link arm is offset with a locking clip while the 39-316 link arm is straight without a locking clip.
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