KINCO window replacement balance rods

A home owner from Jacksonville, FL says:
I need to get replacement balance rods for some KINCO windows - seems that they are an 'odd' size....
Mine measure 12", and have a stamped number on the channel that reads: 1140

I cannot locate the correct replacement piece on the web - i might be looking in the wrong place?!
user submitted photos of channel balance and attachments
Profile picture of Donna
Donna from SWISCO responded:
Hello,
Thanks for contacting us with photos; looks like you have a Series 351 Balance.
The Series 351 has 19-002 and 15-002 fittings attached

A 12" length balance is very small, must be a tiny window.
We have just added the 12" Series 351 Channel Balance online for you.
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