A while back someone entered an issue on this with reference to an Alfa Technical bulletin.
It stated something about engine Nos. later than 13xxx and between 90xxx and 13xxx with blue marking on the variator housing the kit can be installed to the variator. Engines with green marking or engine no. below 90xxx a new variator and inlet cam (of a new version) has to be fitted – and noisy variators can be repaired with this kit in the future, I presume.
I have checked my 2.0 16v ‘96 but can’t find the engine no. or se any colour markings on tha variator housing, so I’m sure mine’s of the “beta” version – it’s been changed in Oct. ’98, though.
If you need the exact nos. and cannot find the issue, I have a hard copy of the Bulletin which I can fax to you.