stamp option #

A handy person from Hollywood fl 33027 says:
My stamp option on window balancer is 2990 which is not among the one you have, is this will cause any problem for me?
Product code: S351-30

please advise, thanks
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Tom from SWISCO responded:
Stamps that end with "90" are an old type. Manufacturers have since changed how they designate codes. One of our options may still work, but I recommend placing your sash on a scale to determine its weight, then referring to the chart we show on the S351-30 store page. That will tell you what will work.
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