13 5 EQ CALDWELL WINDOW BALANCE

It looks like the window balance I need to replace matches S385-14.

However, the stamp on it does not match any of the listed option. The stamp on my window balance reads "13 5 EQ CALDWELL".

Is this a special order balance? I would need two sets of them. May I get them from your company? How much will that be?

Thank you in advance for your help.