Gray tip spiral balance

A handy person from Virginia says:
Ordered S900-29 red tips recently and these worked perfectly. Came across a window in this job which was bigger and had 35 inch spiral balance with a gray tip.

Do I order the 35 inch black tip?
A handy person from Virginia says:
Never mind,
I see there are a few Spiral balances each 35" long, each with a double row of pins, and each with a different color tip. Best approach as you state in other answers is to weigh panel and use that as the determining factor.
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Tom from SWISCO responded:
Awesome, glad to hear you were able to figure it out. You are correct: when in doubt, weigh the sash. Every manufacturer likes to use different color tips, and even those colors fade with time, but hard numbers never lie.
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