I think the catcher is very differnt to a normal rover catcher, they ran with this style for a couple of years before changing it again. The easiest wat to tell is open the back flap and take some pics of the opening, top to bottom.
Here's a few pics of one of mine
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You'll note there's no "tongue" on the catcher, it hangs over 2 hooks which are under the rear flap attached to the deck, they are about an inch off the top on either side. If they're not here then it takes a bag catcher, identical a rover 460, which hangs off the outsides of the rear door rod.