5/8" sash guide

A quick learner from St. Louis, MO says:
I need to replace this sash guide. It seems to be a match for the product code 18-188, but the 18-188 doesn't have the cap on the top. The measurements are all the same. Any help with the available options would be very much approved.
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A quick learner from St. Louis, MO says:
Here are images of another sash guide for the same style window just with shorter balances.
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Bob from SWISCO responded:

Greetings. This actually reminds me more of the upper half of our 18-159P Top Sash Guide pair. Compare the dimensions and see if you think this pair is what you need. 

A quick learner from St. Louis, MO says:
Can you provide the measurements from the top to the holes? For some reason those are not provided for this model.
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Bob from SWISCO responded:

I have even better news than measurements. It turns out we recently brought in a version of this guide that's just the top half, that looks much closer to what you have. See our 18-204. Note that the hole spacing measurement is included in the pictures. 

Alternate view of 18-204
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