My trailing arms are creaking..., how do I lube these thing? Options

[ss6]

It's been 2 seasons since the trailing arms were rebuilt (Patrick M/S) which included re-fitting the pivot hardware. Last summer I'd get a random "knock" which drove me nuts trying to find. Finally, at the end of the season, *both* trailing arms started doing it regularly, which cleared up the "wtf" part.

I've never lubed any part of the trailing arm pivots - is this necessary, and if so, how and with what???