Looking for BRM piston no: 3 or 4

Hello,
Any guy that could help me to find a piston to replace one of mine on my Jetta 2006 TDI BRM. The bore needed is 79.480mm and it's to replace my stock piston no: 4 that has been cracked by a metal debrit ussued from a cam dammage. I just need one piston not all the set.

A use piston will be correct, it has not to be brand new because my engine is not new. (140K Km)

Thanks
Louis

It's been a while, but I have a source for new ones in the past. If you don't have any luck finding used let me know and I'll see what's available.

Used piston

Did you find one? I have one. Near Ottawa