Truth split arm operator

A handy person from Staten Island says:
Having a problem locating this truth split arm operator the outside screw holes are 3 inches center and the split arm in straight position is 7 3/4". If you don't have this one, does it matter to me if the split arm is a little longer or shorter as long as I can lock the window. thank you again for all the assistance you have always given me. Resubmitted just in case. Not sure if the pic was included in the first message. Thank you.
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Tom from SWISCO responded:

Hello! Thanks for your patience during this busy season. Based on these photos I believe you need our 39-317 operator. Look it over and let me know if you agree. Just note that you don't want to measure the arm as one piece, but as two separate pieces. The diagram below will show you what I mean.

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