zulutown: Le mie sincere scuse - non ho guardato presso la vostra sede. Totalmente imperdonabile.
(My sincere apologies - I did not look at your location. Totally inexcusable.)
I strongly suspect that the Bowens stands are actually made by Manfrotto. Here are details of the Bowens distributor in Italy, I am sure that they will be able to help you:-
Gruppo BP
Via C. Tacito 6
20137 Milano (rather conveniently for you!
)
Italy
T +39 550 15489
F +39 2541 21381
info@gruppobp.it
www.gruppobp.it
Another silly question, I do have a Manfrotto 498RC2 head.
Is it possible to use Manfrotto 498RC2 with the Bowens BW 6615?
Not a silly question at all - though I won't ask why you want to be photographing over fences. I hope it is just for the panoramas and not for State Secrets or young ladies 


(In case that doesn't translate very well, it was intended to be a joke)
No, the Bowens stand mentioned does not have a thread on the stud (Bowens only make studio flash and hence none of their product line requires the threaded top stud) so your Manfrotto head would have nothing to fasten to. You would probably have stability problems with your camera high on an inverted pendulum anyway. If the combination is really important to you then Manfrotto's own range of stands are the first place to look. Availability may vary between UK and Italy so the best thing to do is a local search.
In the future I will add a second Speedlite with its own "stand", so what do you think about the idea of having (in future) both a lightweight 2 meters tall and an heavier 3 meters tall one (i.e the Bowens)?
Each of us has different needs in stands. I have a selection but the only ones I actually use are either the tall ones described or a couple of really tiny ones. I've got a couple of 2 metre stands which I never use - truthfully, I know I have them but I don't know where they are! With the flash higher than the subject (natural position) I would be restricted to seated subjects or children. I can get everything I need by not extending the BW-6615 fully withut the restrictions of the 2m stands. A nice tall stand to start with, followed by a 2.4m lighter stand would be my choice. Other people will have totally different needs.