I asked my friend at O'Reilly's and he said if you can re-use the ones in your truck do it! Clean them well...soak them in gasoline for a week...whatever it takes but don't discard any zerk made in the USA. He said if you no longer have the original ones find a wrecking yard and buy as many as you need there.
So I started looking around. If you want new ones buy them from McMaster Carr. I checked and they have zinc-plated, brass or stainless steel. Some are made in the USA and some are made in Germany. However the 90 degree ones are made in Colombia. Just watch to be certain if you want USA made ones. You can find out the country of origin by clicking on "product details."
