1/2 " non-tilt channel balance

A home owner from Florida says:
I would appreciate your opinion prior to order these, will need 30 units. The metal is 27" long and the bottom shoe is 1" so it appears that the S351 with 2640 is the correct replacement. The stamp on the metal is 2640 with a special character after the number. The 18-09 appears to be the best fit on the top sash guide, the top is not as square as the existing and the screw holes are circular instead of elongated but the measurements are similar.

Appreciate your assistance
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Bob from SWISCO responded:

If the shoe's depth is 1", then you are correct, you have an S351-27. For a stamp option select 2640. The Top Sash Guide appears to be either the 18-009 or possibly the 18-166, which is similar. Please compare to be certain. Let me know if you have further questions. 

A home owner from Florida says:
18-166 it is, Bob appreciate the help.
18-009 : 5/8
5/8" Top Sash Guide
18-009
$1.00
VIEW >
S351-27 : 27
27" Series 351 Channel Balance
S351-27
$10.05
VIEW >
S390-27 : 27
27" Series 390 Channel Balance
S390-27
$9.84
VIEW >
18-166 : 5/8
5/8" Top Sash Guide, Kinco
18-166
$1.33
VIEW >
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