As Gizmo said there should be brackets on the bottom part of the handles for the catcher to hang off.Here is a pictures of the back of one of my Corvette's.Same mower just a different Cowl and a different name.
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The second picture isn't my mower it was on eBay late last year,but you can see how the catcher fits.Need anymore pictures let me know and I'll pull my mower out and take some pictures.
This is it from a sales brochure.
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Here for a good time,not a long time.