Bushes for rear lower suspension arms

[FireFury]

When the rear lower suspension arms snapped a few years ago I replaced them with Hardrace ones (https://mr2-ben.co.uk/products/1242).  Has anyone got any experience with these?  They don't seem to have worn well - the bushes now need replacing.

Does anyone know if there are replacement bushes available, or am I going to need to replace the arms again?

Thanks.