Yakko, 028 105 243 T is the harmonic balancer.
Per TDIClub posts, I bought 3 from Bora Parts for project cars. This one is very heavy, it does come in a box with Vaico label, but it is made in Turkey, or so the decal says. My second green B4 has a good looking TB + tensioner, etc. so I'm not going to be doing a TB change soon on this ride. I'll need one for the project car: 1996 TDI, however.
If you (or anyone else) wants one, I have two available for $75. S&H included. Bora list is $108+. I eat the difference. PM if interested. Jeff