390 balance with stamp 27D and stop

A professional from Illinios says:
March 25, 2011
I have some block and tackle channel balances that have a stamp of 27D on them. The true length of the metal channel is 28". Your model # 390 has the same plastic ends. What length of balance should I order. Also can you identify the balance stop in the picture. I believe your part number 18-031 is the correct one.

Thank you Pat L
user uploaded photo of channel balance and guide
Profile picture of Casey
Casey from SWISCO responded:
March 28, 2011
Hi Pat,
Looking at the sent images it does look like the 28 inch Series 390 balance assembly . Choose the Stamp option 2740, this is the equivalent to the 27D stamp.

The top sash guide, looks like the 18-033 or possibly the 18-031 . You will need to compare the dimensions of your original to the detailed product images we provide online.
%alt%
Top Sash Guide, SeasonAll
18-031
$2.92
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Top Sash Guide
18-033
$1.72
28" Series 390 Channel Balance
28" Series 390 Channel Balance
S390-28
$10.45
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