Truth 45251 window crank replacements

A quick learner from 68701 says:
Looking for replacements for Truth 45251 window cranks. The model 39-171 is very close, but the top split arm is 5" long verses 4 3/8" on the 45251.

Thanks,
Phil
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A quick learner from 68701 says:
Another possibility may be to replace the top 5" arm on the 39-171 with the current arm and use a 62-014 rivet.
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Dave Sr. from SWISCO responded:

Please take a look at two operators similar to yours: our 39-318 and 39-388. See if you could adapt one of these to your window. The 39-171 could also possibly work, but you will need to move your sash bracket to compensate for the arm difference or swap the arm from your old operator using the 62-014 rivet. Look all the part numbers I mentioned and get back to me with your thoughts. 

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