Anyone know if you can get the trailing arm bushes (the ones with the big metal bar through the middle of them, furthest forward on the subframe) in polyurethane?

Powerflex don't do them (or at least don't seem to list them on their site) and I'm struggling to find them anywhere else.

Vibra-technics seem to do one but don't have ANY details for it though the info on their site seems to suggest they still use rubber rather than poly?

Has anybody replaced those bushes on a Focus for poly ones (these bushes are a fairly common MoT failure) or knows where to get a replacement set in poly? I don't mind ordering from the States if they are stocked over there somewhere?

Cheers in advance