There are two types of Heim joints... Stamped and milled. Don't buy the stamped ones. 3/8" milled Heims are $4-$5 each from Mcmaster, and they are MUCH better.
To your Q... You can purchase Heims that have grease zerks, they are more expensive and I'm not sure they are worth it over the standard factory lubed joints.
Wow, that McMaster's has every fitting known to man!
Cheap too
Thanks for the tips
).......you'll find that nothing makes us happier than being able to help. .