I think a lot of people just ry and get the parts second hand, there's the section in here and also the one on the tdiclub where you can post an add. The pistons and rods probably come in sets so they're all equal, there's bound to be a reasonable difference between brand new and 100,000 miles worn and puting in just one new piston and rod might upset the balance of the engine but I think it'd be fine with second hand one. franko6 on the tdiclub is supposed to be the man when it comes to head work, I'd ask him.
welcometomyturbodies
welcometomyturbodies