Channel balances

A handy person from VA says:
Channel balance is 35" long, not including top and shoe attachments. I think the one I need is series 351 and spring weight of 3440 (based off stamp number) but I'm not positive. I also need top sash guides, and I think the ones I need are the 5/8" in black product code: 18-009, but again I'm not positive. Unfortunately I dont have a picture of that right now but can send one later to confirm.
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Bob from SWISCO responded:

Thanks for writing in. Yes, this is either a S351-35 or S390-35. he only difference between these two balance Series is the 'depth' of the bottom nylon shoe. The Series 351 bottom nylon shoe has a depth of 1", whereas the Series 390 bottom nylon shoe has a depth of 1-1/8". Compare with your old balances and see what you think matches best. You will indeed need a stamp option of 3440.

For you Top Sash Guide, it would be best to see 'mugshot' pictures of it removed from the sash, from the front and side. 

A handy person from VA says:
Here are the pictures for the top dash guide. I also included a picture of the bottom nylon shoe, is this the correct part measuring a depth of 1 1/8"?
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A handy person from VA says:
After looking at the top sash guides more, I think the one I need is 18-163. Measurements were about the same, hard to tell 13/32 but it's probably close to that. Does that sound right?
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Bob from SWISCO responded:

Thanks for getting back to me. I agree, your Top Sash Guide looks like the 18-163. As far as your channel balance goes, you are indeed measuring the correct dimension for depth: if it's greater than 1" (or 1-1/8" exactly), then the S390-35 is the better match. 

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