If you just want functional wheels, some others do fit. Quite a few other brands use 1/2" axles, [Honda, SupaSwift, Rover...]

Victa is a bit unique, in that they went to 9/16" diameter axles after the Model 5's, and stuck with that thereafter.

Cheers,
Gadge

"ODK Mods can explain it to you, but they can't understand it for you..."

"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."