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@M-X
I think mdcc_tester might be onto something in that the 105 design has changed: e.g. this is very confusing (says v1 but clearly v2 spline: http://www.biketiresdirect.com/product/shimano-105-bb-5500-v1-octalink-bottom-bracket) but other than that I think you're ok with the ultegra one which is definitely v1..
Sheldon says:
Octalink ® V1 Spline: 9 speed BB-M952 (XTR), BB-7700 (Dura-Ace), BB-6500 (Ultegra), BB5500 (105)
V1 BB spline grooves 5 mm long, ridges 2.2 mm wide.
That said I run mine on the 7710 track BB, just because the DA road one is unsealed. I assume OP used a 7700 or something else as he said it was italian threaded (7710 is english only because NJS)