Thanks alot for taking the time to answer.
I already know these sources but i consider their pricing at a bit crazy for a common resistor as a RN55, as their normal price at least in US is about 0.1Euro! Why should Europeans pay 60 times more for a standard industry common resistor?
I will probably have to go the hard way and order through SURPLUS SALE OF NEBRASKA where they charge 0.1$ each even for the 0.1% tolerance!
Well I talking about the 50W wirewound resistors with aluminium casing. I don't think they are so expensive like that. We must be talking of different resistors. Check www.vishay.com for datasheets if you like. My resistors are of the SH type.