Hi Rodeobob, the back of these (and the whole base) is wider, while the flap is the usual size, the space to the side of the flap is greater, i have a couple of pics here that may help, i will try and get some better ones up soon if you like. It is a little hard to spot the difference in these pics, but i hope they help (i can also post a few pics of the catcher if you like.
Cheers Ty
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