QTD, I've gotten a few of the MTC ones. They are made in Turkey. They appear to be good quality and have worked fine for me.
Ian,In response to one of your other questions, I recently documented the alternator pulley upgrade. I used the 028 903 119AA on my OEM 93 Jetta alternator. (http://www.vwdiesel.net/forum/index.php?topic=24517.msg222375#msg222375). You'll need a special splined bit set (MN3400 from metalnerd/Roseland).Jer