Searching for top sash for 33" series 385 channel bala

A quick learner says:
I bought 33" S385 Channel Balance for my windows. I now need to buy 1/2" top sash guide for channels. I see 2 models on your website: 1/2" Top Sash Guide Code 18-036 and 18-180 . Which one is the right fit for my channel?

Thanks
A quick learner says:
Here are some photos of the current sash I have, unfortunately this sample is broken at the top. The length is about 23/16", width is about 1/2", depth is about 9/16", distance from top hole to top is about 1/4", 2nd hole is about 7/8" from top. Please let me know the best fit for this.

I need 30 replacement sash urgently, please help.
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Emily from SWISCO responded:

Hello!

Thank you for your patience during our busy season. It's difficult to say since your top sash guide is damaged, but take a look at our 18-064 or 18-115 . Carefully compare our dimensions to an undamaged top sash guide and see if either match what you need.  

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