want to buy a vacuum tank to the air conditioning for my 360glt. It is the same you find on the right fender on for example 740(with A/C) and 240turbo with cruise control.

Hello and welcome to the forum!

I don't understand, what do you mean by a "vaccuum tank"? Have a look at this thread, if it helps:
http://www.volvo300mania.com/forum-uk/v ... f=5&t=8383

Cheers

Tom