and do you know any websites (armyshop in Europe) where parts of webbing M55 are offered? For example when I would like to buy a Danish small or large pack M55 I don´t know any European shop.
I know there are some Danish items on the Ebay. But the sellers are nearly always from the US (terrible postage costs to Central Europe).
Ostravak, there is no such thing as "webbing M55". You are either looking for Danish M45-50
The might look similar, but there are several key differences between them (colour, fittings, pouches, carriers).
Danish webbing, model M45-50:
Danish webbing, model M/45-59:
Danish webbing, officers (and similar uses) late 1960s.
There is no real vendor (website or physical shop) that sells entire sets of either the M45-50 or the M45-59 webbing.
You need to be patient, look through eBay or similar. From time to time https://www.417.dk/shop/frontpage.html sell bits and pieces of webbing.