34and 3/8" block and tackle balance

A professional from Lexington says:
May 2, 2018
Need some help on a 1/2" block & tackle, non tilt balance. Your part # S390-34 will work with 50 weight number, but I need (2) each that the tube actually measures 34 3/8" long. Can you guys get these? Let me know if any questions.
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Tom from SWISCO responded:
May 7, 2018

That 34-3/8" measurement has me a little suspicious. I wonder if you have a certain special kind of balance. This balance is similar to the Series 390 at first glance, but is actually incompatible. Would you be able to show us a clear picture of the top and bottom nylon attachments? That will allow us to confirm.
34" Series 390 Channel Balance
34" Series 390 Channel Balance
S390-34
$11.73
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