There was/is a lot of discussion about the TT bearings. 6006-2Z is the size but the clearance should be C5 if possible and grease should be H51. These bearings are almost impossible to get. So I did some research my self and received some info from Sander that was very helpful. In Dutch partly, sorry for that.
TT deepgrove GJN bearings datasheet.pdf
TT lagers artikel over smering.pdf (dutch)
TT lagers bericht Sander.pdf (dutch)