Sash Guide Help

A quick learner says:
I have a broken channel balance but was able to find that part (S351-31), but I'm having trouble finding the correct sash guide. I think it may be 18-018, but not certain. Can you take a quick look at the attached and let me know? I'm not sure on the make/model of the window - it's an older home built in the 80's I believe.

Also - there was only 1 channel balance in the window when we bought the place. I'm assuming there should be 2 - one on each side. Is that assumption correct?
User submitted photos of a top sash guide.
Profile picture of Paul
Paul from SWISCO responded:
This looks similar to our 18-064. Check it out and see what you think.

There should be two balances on each side of the sash, yes.
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