Flywheels are not normally made by a range of manufacturers, The one euros list are made by either LUK or Valeo both o.e. suppliers to Fiat/Alfa. I have encountered the non-start problem once on a transit, but that was because it was a new version for which the wrong flywheel was supplied. I should have checked it more closely (I did check it quickly) Euros are excellent for things like DMFs because they buy direct from the manufacturer. Alfa don't actually make these so when you get them through a dealer your paying through the nose. Incidentally your garage will be able to get a discount from the dealer, even if it's only 10% it's still an extra £60 he earns. Perfectly legitemate but may be cluoding his judgement! Job should'nt really cost more than £750-£800 unless you're using a franchised dealer.