Front bush (Powerflex, I can't work out which is the Superpro version)
linkAlthough, if you haven't bought the WALK yet, I notice Superpro are now offering a conversion kit using their bushes which does the same thing to your existing rear mount. Might be worth investigating if it is a decent alternative, I reckon it will be.
LOL @ JBS's quote of 4 hours to fit!!!
Speak to Mike at VWSpeed, he'll get them cheaper for you.
link