Made by the people who made them for VW these bushes will be a perfect fit for when you have to replace them, generally through a trailing arm swap.
These come from an Original Equipment Manufacturer - OEM. If you check the moldings you'll see where the VW Audi markings have been ground off as whilst there is no restriction on the manufacturer selling them, they're not permitted to sell them with VW's markings :)
So... Genuine VW parts at an aftermarket price!
Trailing arm spring towers seem to be rusting at an alarming rate and when you come to remove the arm the outer bolt is generally seized into the bush meaning the bolt has to be destroyed to get it out leaving a broken bit of bolt in the hole.
You may also need a M12x1.5 bolt, 105mm long - See related items below
Price is per bush, there are 2 bushes per arm. for a T3 (4 per vehicle)
These are also fitted to the T4 rear trailing arms, on the inner end, 2 per vehicle.