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BB-5500 is OK
Some BB-5500s are OK, they didn't change the model number when they changed to the longer V2 spline, so you never quite know what you're getting. Always make sure you specify V1 as being of the essence when placing an order, then if somebody sends you a V2 you can insist that they take it back at their expense.
gbj_tester
Yep, you need the shorter grooved octalink BB. BB-5500 is OK. Sometimes known as octalink V1 - shimano sneakily changed the spline length on the "v2"
Although, I'm not sure if italian thread, BB5500 70 x 109 (109mm is the axle length you need) exists?