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  1. Auxiliary belt for 1.6 with air-con, ¿1842mm or 1855mm?

    Alfa 147, 156 & GT
    Hello friends, how's it going :) I have to change the auxiliary belt on my 147 1.6ts, but there are two different belt sizes, 1842mm or 1855mm, it seems 1.6 can have two different alternator pulley sizes, how can I know which one mine uses? Thank you...