Did you buy them in the end.
Not bad 65 quid with the inserthttps://www.cbauto.co.uk/cookbots
These are the inserts to go in to the 45mm front bushes to reduce them to 30mm thus reducing movement. Then combine it with the adjustable powerflex bushes with the bigger insert even less. Solid mount subframe and you have a pretty rigid front end . Use upper and lower strut braces too