I usually put the Victa catcher on instead of the bag catchers when all you need to do is swap the rear flap but usually don't spend a lot of time modifying them these days as I'd only get $80. for a serviced self drive mower.
There isn't much of a problem around my way finding bag catchers as they are mostly thrown out with the mowers, I must have thrown out 50 bag catchers recently.
The Makita ,Ryobi ,Baumr-AG ,Shogun ,Ferrex ,etc have similar catchers that can easily be fitted ,but not worth buying a new catcher as you would easily buy a good mower with catcher cheaper than a new catcher.
Sometimes the catcher frame needs a slight hammering to widen the opening 3mm and the angle of the catcher can be wrong when fitted but if you bend the catcher frame down a little it solves that problem and takes less time than changing the rear flap if you used the Victa catcher.
Had a few self drive mowers where I just sold them without a catcher as I used a mulch plug with the mower instead.
