Marvin casement window crank handle

I don't know how old these windows are since we just moved in, and I can't find a model name or part number other than Marvin. But this handle seems to be about 4 inches long, and attaches in the middle of the plastic cover. Whereas replacement handles I've found so far online are either 3 5/8" or 4 3/8" and attach near one side of the cover.

Thanks for your help!