What top sash guide goes with Series 351 channel balance?

A home owner from crawfordsville, indiana says:

I recently ordered & received 2 window balances:
17" Series 351 Channel Balance
S351-17, option: 1620

I found I need to order a top sash guide & need to know the one to order. It looks like #18-008. Is that the right one?

Ken M.
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Paul from SWISCO responded:
Hi Ken,
Yes, the 18-008 could be the needed replacement, just compare the dimensions to one of your original top sash guides before ordering.
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