Spring for a Leigh 8433 metal bifold door

A home owner from ma says:
I need this part for my Bi Fold metal door but i didn't see any spring in assembly. do we need to buy the spring sprate and what about the bottom of the door do we used same assembly. My door is Leigh and part number is 8433 because i saw paper on the door. I need help to find the right part . Waiting for soon reply

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Paul from SWISCO responded:

Possibly 21-048 for the bottom pivot and the guide with the spring may be our 21-058.

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