Need Help Identifying 2720 Channel balance

A home owner from Jackson says:
Good afternoon,

I would like to order 2720 channel balances. I am not sure which ones to order I have included pictures..
Channel balance
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Tom from SWISCO responded:
Thanks for contacting us. You could need either Series 351 or Series 390 balances depending on the size of the shoe. The 351 has the 15-002 shoe which is 1" deep and the 390 has the 15-001 shoe which is 1 1/8" deep. 2720 is the stamp option you'd choose. You also need to measure the length of the metal part of the channel not including the plastic ends.
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