Beanie

Hi All, After some rear tyres for a Boomerang as I'vre resurrected the old girl for my nephew to use and the rears are worn out, Tamiya oval blocks would be ideal but wayyyyyyyy to expensive on Fleabay?!!! I notice the rears from a Wild One look identical, anyone know if they'd fit? Anyone got some ideas of tyres I could get to fit the rears, maybe from a more modern car, that won't require me to apply for a new mortgage!!!