Mich, I'd personally refer to it as a SupaSwift Big Bob just for easy reference as they look to have the same body bits and that's what you're after.
You may find Victa bushings are compatible as my rear catcher SupaSwift 767 takes Victa (as well as Rover) blades and the same front axle spring retaining clips as the Victa steel base domestic rear catcher mowers.
I think that was an appeal of the SupaSwift brand was it accepts parts from the bigger makes. A bit like American car maker AMC and how it used various parts from Ford, GM and Chrysler for their cars.
