Suprisingly I have few leads already and I feel fairly confident it will work out.
Re: Bushings,
I got everything but the roll bar bushings from the Maseratisource(QP III/Longchamp set), who puts them up on ebay every now and then(price, very fair). He has his own web page too. Roll bar bushings from Roland (I might get the spidle from him too). I have to say, I´m glad that when ever it gets tricky to find something, Roland will bail me out...
My rear is in a pretty good shape (the car, I mean), so we did only the front, which most definately wasn´t. Maseratisource should have the parts for the rear too, as QP III parts should do the trick. I did not need the steering bushes, but again you should find the necessary parts from Maseratisource, as you have the ZF-rack.