bushings for the rear springs

[Toby B <toby@wolfenet.com>]

Hi all,
        My rear axle is wiggling around a bit.  Everything's still bolted
together (surprise!), so I wanted to replace the bushings on the leaf
springs.  Anyone sell/seen/heard of harder bushings for the front anchor
point? (where the front of the leaf hooks to the frame)  Urethane,
Delrin, carbon fiber<grin>?  I want to leave rubber in the rear
shackles, but reducing the amount of deflection in the front seems to
make sense...
Thanks,
Toby