This site sponsor, American Classic, sells parts.
If you clicked on their flashing logo above, entered the year and went to water pump you would find this:
http://www.americanclassic.com/asp/...&iyear=1953&ytype=to&exyear= I checked a national parts chain here in the US and found this for a water pump for a 235 engine.
http://www.partsamerica.com/ProductList.aspx?PartType=54&PTSet=A&SearchFor=Water%20Pump You should go to the links section at the top of this page and order catalogs from as many vendors as you like. If they do not mail to Germany you should be able to look at most of their catalogs online.
If you have not gotten a service manual for your truck, you should get one. It would be extremely difficult to restore your truck without a service manual. Look on Ebay. Check on the links button at the top and talk to vendors who sell manuals and see if they have one for your truck.
I have found the Keith Hardy site very helpful. It has an abundance of free information about the Chevy vehicles. There is a service manual for the 1953 Chevy truck at this site. ( I don't believe there is anything specific for the 1300 model.)
http://chevy.tocmp.com/index.htm Hope this helps get you headed in the right direction.
