Pella casement window hardware replacement

A home owner from 18106 says:
Will the Product Codes 39-451 and 39-452 (Truth Operator Cover and Handle) fit a Pella casement window?
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Tom from SWISCO responded:

They will not, unfortunately. Truth brand parts like the 39-451 and 39-452 have handles with an 11/32" spline, while Pella operators all require a 3/8" spline as a rule. 

I am very sorry for the inconvenience.

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