I dont recognise the setup you mention, doesnt sound factory at all. I wonder if you have a dealer fit a/c system rather than a proper factory fit one? have you got any pictures to help us ID it? if you want to keep the a/c you should be able to fit the proper factory alternator bracket and spring loaded tensioner arm, though you may have to change the a/c compressor for a genuine VAG one as it may not fit with the oem alternator brackety
if you arnt bothered about the a/c you could convert to the earlier spring loaded alternator setup, you can use one from any 1.8-2.0 8v mk3. you'll need the alternator, spring and the bracket under it, plus the waterpump pulley and belt. swap all this onto the abf and bobs your uncle!